How to obtain movie thumbnails, chapters etc

Sorry for asking this question which I can’t help thinking is very easy to answer!

Being an absolute novice to all this and not that computer savvy (although I’m slowly learning) could someone possibly tell me how and where to get movie information like chapters and the movie picture etc? Is it done through an ‘add on’?

I currently have a few movies on a external hdd which I will be changing for a NAS drive soon once I get my head round how they work.

Many thanks in advance!

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