Accepting the Terms of Service
Dealing with spam and ToS violations
Registration/Authorization
Working with GIFs (actually MPEG4 GIFs)
Working with Public Service Announcement and MTProxy channels
Working with TSF (internal use only)
Working with Telegram Premium
Working with Seamless Telegram Login
Working with accent colors »
Working with channel recommendations »
Working with channels/supergroups/geogroups
Working with chat invites and join requests
Working with chats/supergroups/channels
Working with cloud themes
Working with custom animated emojis
Working with emoji keywords
Working with emoji statuses
Working with fragment.com usernames
Working with giveaways & gifts
Working with instant view pages
Working with message reactions
Working with message translation
Working with mini bot apps »
Working with saved message dialogs »
Working with secret chats
Working with telegram passport
Working with temporary profile links
Working with voice message transcription
Working with wallpapers »
Working with bot admin right suggestions
Working with bot inline queries and callback buttons
Working with bots (internal bot API use)
Working with contacts and top peers
Working with credit cards
Working with group calls & live streaming
Working with imported chats
Working with localization packs
Working with media autodownload settings
Working with media autosave settings
Working with message threads
Working with notification settings
Working with notification sounds
Working with scheduled messages
Working with sensitive content (NSFW)
Working with sponsored messages
Working with the attachment menu » of mini bot apps »
Working with the native anti-spam system
Working with the takeout API, see here » for more info.
Working with the bot menu button »
Working with the user's account
Working with user profile pictures