Common rights
- Send messages: turn it off for an announcement-only group;
- Send media: controls photos, videos and files;
- Stickers and GIFs: fine for fun groups, better off in work groups;
- Create polls: enable when you want feedback;
- Invite users: restrict to admins to avoid random adds.
Recommended presets
Announcement group: admins only, everything else off. Discussion group: messages and media on, invites and pinning off. Internal group: invites off with join requests on.
Admins
When adding admins, tick rights one by one and check how anonymous admins and custom titles appear.