Create
- New Message → New Group and pick initial members;
- Set a name and photo, optionally make it public with a custom link;
- Configure permissions and admins under Manage Group.
Public vs private
- Public groups are searchable with a short link — good for communities;
- Private groups are invite-only — good for internal teams.
Management
- Upgrading to a supergroup raises the limit to 200,000 members;
- Give admins specific rights rather than full power;
- Slow mode prevents flooding.