- data exchanging between view controllers
- URLSession
- UserNotification
- CustomView (xib + code)
- label in uiview (contentSize)
- phoneCall View
- TableView + Cell
- ScrollView
- code autolayout (+ SwitfUI Previews)
- animation ball bounce
- CollectionView + Cell
- compositional layout(collectionView)
- horizontal scrolling
- appending data to collectionView
- DiffableDataSource instead dataSource
- update cell