Check out or check in files in a document library - Microsoft Support

Learn how check files, folders, and links out of your SharePoint document library, and check them back in or discard a check out.

Check out or check in files in a document library - Microsoft Support

Check out, check in, or discard changes to files in a SharePoint

Problems checking in from Word and Powerpoint 2016 - Microsoft

See who a file is shared with in OneDrive or SharePoint

Enable and configure versioning for a list or library - Microsoft

Upload files and folders to a library - Microsoft Support

Sync SharePoint files and folders - Microsoft Support

How To Check-In & Check-Out Files in a SharePoint Library

Create, change, or delete a view of a list or library - Microsoft