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.

SharePoint Online with Forced Checkout and Synced Folders

Publish or unpublish a version of a file - Microsoft Support

Sharepoint Check-in / Check-Out Issue - Microsoft Q&A

Top questions about check out, check in, and versions - Microsoft

Connect web parts in SharePoint - Microsoft Support

Using require check out option with Sharepoint makes local file

Check in and Check out feature in SharePoint

What is the point of checking in/checking out when I have to do a

How to Access Checked-Out Files - SharePoint Document Checkout