Check out, Check in and Versions are features that let you manage files exceptionally in SharePoint. When you want to edit a file, just check out the file, make necessary changes and check in the document back. When you check out a file it will be available for editing only for you. Apart from that, you can also discard check out to completely wipe out any changes you wish to undo. By doing this you can also ensure that it is not affecting the version history.
Document libraries are storerooms in the SharePoint environment that consists of all kinds of documents and data users require. The highlight is that anyone in your team or group can access it from any device, anytime. As in the case of accessing the files and folders as required, adding or uploading files to a SharePoint Document Library is also an important process which needs to be managed well. An easier upload makes the system more efficient and user-friendly.