Recommended uses:
Microsoft Teams is a collaborative application that allows teams to come together to work. It enables hybrid work, for meetings, conversations, document collaboration and more.
Microsoft Teams should be used as temporary workspace for projects and tasks. Users can later transfer documents to the appropriate repositories. (For Employees this will be departmental, school, or committee SharePoint sites, etc. For Students this will be personal one drives)
If the collaborative workspace is no longer needed users can delete it, otherwise it will automatically expire after a period of inactivity.
Go here, for a short video from Microsoft on how to get started with Teams
Additional Resources
Getting Started with Microsoft Teams
Expiration of Microsoft Teams and Groups