Each team contains channels. Each channel is built around a topic such as team activities, a department name, etc. Meetings and conversations take place in a channel, and files can be collaborated on. Each channel also contains tabs (e.g. Messages, Shared, etc.).

Manuals

All documentation about standard channels, private channels and shared channels in Microsoft Teams can be found at First things to know about channels in Microsoft Teams (Microsoft).

Some tips for administrators of a Microsoft Teams team

Some general tips