diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_folder/component/AddFolderToClassList.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_folder/component/AddFolderToClassList.kt
index 375bd6c2..f3bcd887 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_folder/component/AddFolderToClassList.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_folder/component/AddFolderToClassList.kt
@@ -11,7 +11,6 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.CircleShape
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme.colorScheme
 import androidx.compose.material3.MaterialTheme.typography
@@ -35,9 +34,7 @@ import com.pwhs.quickmem.domain.model.folder.GetFolderResponseModel
 import com.pwhs.quickmem.presentation.ads.BannerAds
 import com.pwhs.quickmem.presentation.app.library.component.SearchTextField
 import com.pwhs.quickmem.ui.theme.QuickMemTheme
-import timber.log.Timber
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun AddFolderToClassList(
     modifier: Modifier = Modifier,
@@ -109,8 +106,7 @@ fun AddFolderToClassList(
                             )
                         }
                     }
-                    items(filterFolders) { folder ->
-                        Timber.d("List folder ID: $folderImportedIds")
+                    items(items = filterFolders, key = {it.id}) { folder ->
                         AddFolderToClassItem(
                             folder = folder,
                             onAddFolderToClass = {
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_study_set/component/AddStudySetToClassList.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_study_set/component/AddStudySetToClassList.kt
index 12eba821..3508139a 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_study_set/component/AddStudySetToClassList.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/add_study_set/component/AddStudySetToClassList.kt
@@ -36,7 +36,6 @@ import com.pwhs.quickmem.domain.model.subject.SubjectModel
 import com.pwhs.quickmem.domain.model.users.UserResponseModel
 import com.pwhs.quickmem.presentation.app.library.component.SearchTextField
 import com.pwhs.quickmem.ui.theme.QuickMemTheme
-import timber.log.Timber
 
 @Composable
 fun AddStudySetToClassList(
@@ -127,12 +126,10 @@ fun AddStudySetToClassList(
                             }
                         }
                     }
-                    items(filterStudySets) { studySet ->
-                        Timber.d("Check isAdd: ${studySetImportedIds.contains(studySet.id)}")
+                    items(items = filterStudySets, key = {it.id}) { studySet ->
                         AddStudySetToClassItem(
                             studySet = studySet,
                             onAddStudySetToClass = {
-                                Timber.d("Study set added: $it")
                                 onAddStudySetToClass(it)
                             },
                             isAdded = studySetImportedIds.contains(studySet.id)
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/folders/FoldersTabScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/folders/FoldersTabScreen.kt
index c0f91000..c9b92019 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/folders/FoldersTabScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/folders/FoldersTabScreen.kt
@@ -48,7 +48,7 @@ fun FoldersTabScreen(
                         modifier = Modifier
                             .fillMaxSize(),
                     ) {
-                        items(folder) { folders ->
+                        items(items = folder, key = {it.id}) { folders ->
                             FolderItem(
                                 modifier = Modifier.padding(horizontal = 16.dp),
                                 title = folders.title,
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/members/MembersTabScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/members/MembersTabScreen.kt
index b5f7644d..34dea048 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/members/MembersTabScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/members/MembersTabScreen.kt
@@ -46,7 +46,7 @@ fun MembersTabScreen(
                         modifier = Modifier
                             .fillMaxSize(),
                     ) {
-                        items(member) { member ->
+                        items(items = member, key = {it.id}) { member ->
                             ClassMemberItem(
                                 modifier = Modifier.padding(horizontal = 16.dp),
                                 classMemberModel = member,
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/study_sets/StudySetsTabScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/study_sets/StudySetsTabScreen.kt
index d1bef4ca..838f7737 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/study_sets/StudySetsTabScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/classes/detail/study_sets/StudySetsTabScreen.kt
@@ -47,7 +47,7 @@ fun StudySetsTabScreen(
                         modifier = Modifier
                             .fillMaxSize(),
                     ) {
-                        items(studySets) { studySet ->
+                        items(items = studySets, key = {it.id}) { studySet ->
                             StudySetItem(
                                 modifier = Modifier.padding(horizontal = 16.dp),
                                 studySet = studySet,
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/ExploreViewModel.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/ExploreViewModel.kt
index 46a5d9cd..52b305ee 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/ExploreViewModel.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/ExploreViewModel.kt
@@ -1,6 +1,7 @@
 package com.pwhs.quickmem.presentation.app.explore
 
 import android.app.Application
+import android.widget.Toast
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.pwhs.quickmem.core.data.enums.CoinAction
@@ -229,6 +230,7 @@ class ExploreViewModel @Inject constructor(
                 when (coin) {
                     is Resources.Error -> {
                         Timber.e("Too many requests, please wait 1 minute")
+                        _uiEvent.send(ExploreUiEvent.Error("Too many requests, please wait 1 minute"))
                     }
 
                     is Resources.Loading -> {
@@ -240,6 +242,11 @@ class ExploreViewModel @Inject constructor(
                         _uiState.update {
                             it.copy(coins = coin.data?.coins ?: 0)
                         }
+                        Toast.makeText(
+                            getApplication(),
+                            "You have earned 1 coin",
+                            Toast.LENGTH_SHORT
+                        ).show()
                     }
                 }
             }
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/top_streak/TopStreakScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/top_streak/TopStreakScreen.kt
index b7f5f69d..166e7fae 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/top_streak/TopStreakScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/explore/top_streak/TopStreakScreen.kt
@@ -126,7 +126,7 @@ fun TopStreakScreen(
                 modifier = Modifier.fillMaxWidth(),
                 horizontalAlignment = Alignment.CenterHorizontally
             ) {
-                items(topStreaks.size) { index ->
+                items(topStreaks.size, key = { it }) { index ->
                     val topStreak = topStreaks[index]
                     StreakItem(
                         rank = index + 1,
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/add_study_set/component/AddStudySetToFolderList.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/add_study_set/component/AddStudySetToFolderList.kt
index a7e5ab56..ada9efc2 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/add_study_set/component/AddStudySetToFolderList.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/add_study_set/component/AddStudySetToFolderList.kt
@@ -36,7 +36,6 @@ import com.pwhs.quickmem.domain.model.subject.SubjectModel
 import com.pwhs.quickmem.domain.model.users.UserResponseModel
 import com.pwhs.quickmem.presentation.app.library.component.SearchTextField
 import com.pwhs.quickmem.ui.theme.QuickMemTheme
-import timber.log.Timber
 
 @Composable
 fun AddStudySetToFolderList(
@@ -127,12 +126,10 @@ fun AddStudySetToFolderList(
                             }
                         }
                     }
-                    items(filterStudySets) { studySet ->
-                        Timber.d("Check isAdd: ${studySetImportedIds.contains(studySet.id)}")
+                    items(items = filterStudySets, key = {it.id}) { studySet ->
                         AddStudySetToFolderItem(
                             studySet = studySet,
                             onAddStudySetToFolder = {
-                                Timber.d("Study set added: $it")
                                 onAddStudySetToFolder(it)
                             },
                             isAdded = studySetImportedIds.contains(studySet.id)
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/detail/component/FolderDetailStudySetList.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/detail/component/FolderDetailStudySetList.kt
index 23052cec..2e23ff92 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/detail/component/FolderDetailStudySetList.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/folder/detail/component/FolderDetailStudySetList.kt
@@ -90,7 +90,7 @@ fun FolderDetailStudySetList(
                 LazyColumn(
                     horizontalAlignment = CenterHorizontally,
                 ) {
-                    items(studySets) { studySet ->
+                    items(items = studySets, key = { it.id }) { studySet ->
                         StudySetItem(
                             studySet = studySet,
                             onStudySetClick = { onStudySetClick(studySet.id) }
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/home/HomeScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/home/HomeScreen.kt
index 2b0a1f56..d2d74d67 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/home/HomeScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/home/HomeScreen.kt
@@ -475,7 +475,7 @@ private fun Home(
                             modifier = Modifier
                                 .fillMaxWidth()
                         ) {
-                            items(studySets) { studySet ->
+                            items(items = studySets, key = { it.id }) { studySet ->
                                 StudySetHomeItem(
                                     studySet = studySet,
                                     onStudySetClick = { onStudySetClick(studySet) }
@@ -503,7 +503,7 @@ private fun Home(
                             modifier = Modifier
                                 .fillMaxWidth()
                         ) {
-                            items(folders) { folder ->
+                            items(items = folders, key = { it.id }) { folder ->
                                 FolderHomeItem(
                                     title = folder.title,
                                     numOfStudySets = folder.studySetCount,
@@ -533,7 +533,7 @@ private fun Home(
                             modifier = Modifier
                                 .fillMaxWidth()
                         ) {
-                            items(classes) { classItem ->
+                            items(items = classes, key = {it.id}) { classItem ->
                                 ClassHomeItem(
                                     classItem = classItem,
                                     onClick = { onClassClicked(classItem) }
@@ -554,7 +554,7 @@ private fun Home(
                         modifier = Modifier.padding(top = 24.dp)
                     )
                 }
-                items(subjects, key = { it.id }) { subject ->
+                items(items = subjects, key = { it.id }) { subject ->
                     SubjectItem(
                         subject = subject,
                         onSearchStudySetBySubject = {
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/home/components/NotificationListBottomSheet.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/home/components/NotificationListBottomSheet.kt
index b7cb5725..0cde75ce 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/home/components/NotificationListBottomSheet.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/home/components/NotificationListBottomSheet.kt
@@ -88,7 +88,7 @@ fun NotificationListBottomSheet(
 
                 else -> {
                     LazyColumn {
-                        items(notifications, key = { it.id }) { notification ->
+                        items(items = notifications, key = { it.id }) { notification ->
                             NotificationItem(
                                 notification = notification,
                                 onMarkAsRead = {
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/library/classes/ListClassesScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/library/classes/ListClassesScreen.kt
index 9a38804a..fa2cd22a 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/library/classes/ListClassesScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/library/classes/ListClassesScreen.kt
@@ -142,7 +142,7 @@ fun ListClassesScreen(
                                 modifier = Modifier.padding(8.dp)
                             )
                         }
-                        items(filterClass) { classItem ->
+                        items(items = filterClass, key = {it.id}) { classItem ->
                             ClassItem(
                                 modifier = Modifier.padding(horizontal = 16.dp),
                                 classItem = classItem,
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/library/folder/ListFolderScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/library/folder/ListFolderScreen.kt
index d2f46332..db9dcc2c 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/library/folder/ListFolderScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/library/folder/ListFolderScreen.kt
@@ -142,7 +142,7 @@ fun ListFolderScreen(
                                 modifier = Modifier.padding(8.dp)
                             )
                         }
-                        items(filterFolders) { folder ->
+                        items(items = filterFolders, key = {it.id}) { folder ->
                             FolderItem(
                                 modifier = Modifier.padding(horizontal = 16.dp),
                                 title = folder.title,
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/library/study_set/ListStudySetScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/library/study_set/ListStudySetScreen.kt
index 6ecce094..a70a9276 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/library/study_set/ListStudySetScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/library/study_set/ListStudySetScreen.kt
@@ -50,7 +50,7 @@ fun ListStudySetScreen(
     isLoading: Boolean = false,
     studySets: List<GetStudySetResponseModel> = emptyList(),
     onStudySetClick: (GetStudySetResponseModel) -> Unit = {},
-    onStudySetRefresh: () -> Unit = {}, 
+    onStudySetRefresh: () -> Unit = {},
     avatarUrl: String = "",
     username: String = "",
     isOwner: Boolean = false
@@ -146,7 +146,7 @@ fun ListStudySetScreen(
                                 modifier = Modifier.padding(8.dp)
                             )
                         }
-                        items(filterStudySets) { studySet ->
+                        items(items = filterStudySets, key = { it.id }) { studySet ->
                             StudySetItem(
                                 modifier = Modifier.padding(horizontal = 16.dp),
                                 studySet = studySet,
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_class/component/AddStudySetToClassesList.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_class/component/AddStudySetToClassesList.kt
index b2b24c59..e09b14a1 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_class/component/AddStudySetToClassesList.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_class/component/AddStudySetToClassesList.kt
@@ -136,7 +136,7 @@ fun AddStudySetToClassesList(
                                 )
                             }
                         }
-                        items(filterClass) { classItem ->
+                        items(items = filterClass, key = { it.id }) { classItem ->
                             AddStudySetToClassesItem(
                                 classItem = classItem,
                                 onAddStudySetToClasses = {
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_folder/component/AddStudySetToFoldersList.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_folder/component/AddStudySetToFoldersList.kt
index d632c83b..e32d89ca 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_folder/component/AddStudySetToFoldersList.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/add_to_folder/component/AddStudySetToFoldersList.kt
@@ -34,7 +34,6 @@ import com.pwhs.quickmem.domain.model.folder.GetFolderResponseModel
 import com.pwhs.quickmem.presentation.ads.BannerAds
 import com.pwhs.quickmem.presentation.app.library.component.SearchTextField
 import com.pwhs.quickmem.ui.theme.QuickMemTheme
-import timber.log.Timber
 
 @Composable
 fun AddStudySetToFoldersList(
@@ -107,8 +106,7 @@ fun AddStudySetToFoldersList(
                             )
                         }
                     }
-                    items(filterFolders) { folder ->
-                        Timber.d("List folder ID: $folderImportedIds")
+                    items(items = filterFolders, key = { it.id }) { folder ->
                         AddStudySetToFoldersItem(
                             folder = folder,
                             onAddStudySetToFolders = {
diff --git a/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/detail/material/MaterialTabScreen.kt b/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/detail/material/MaterialTabScreen.kt
index 13f15b42..00109407 100644
--- a/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/detail/material/MaterialTabScreen.kt
+++ b/app/src/main/java/com/pwhs/quickmem/presentation/app/study_set/detail/material/MaterialTabScreen.kt
@@ -187,7 +187,7 @@ fun MaterialTabScreen(
                                 LazyRow(
                                     modifier = Modifier.fillMaxWidth(),
                                 ) {
-                                    items(flashCards) { flashCard ->
+                                    items(items = flashCards, key = {it.id}) { flashCard ->
                                         StudySetFlipCard(
                                             frontText = flashCard.term,
                                             backText = flashCard.definition,
@@ -279,7 +279,7 @@ fun MaterialTabScreen(
                             }
                         }
 
-                        items(flashCards) { flashCards ->
+                        items(items = flashCards, key = {it.id}) { flashCards ->
                             CardDetail(
                                 isOwner = isOwner,
                                 color = studySetColor,