Originally Posted by
Bill Kapaun
I have mild Asperger's and some type of attention disorder(s?). I don't know if that applies to you.
SKIP the video's. Many are bad. maybe they need to be slower? IF they don't work, they don't work.
I'd suggest studying Saint Sheldon.
https://www.sheldonbrown.com/repairs.html
Then again, maybe this isn't for you. I'm useless when it comes to Arts & Literature.
Take your time.
I find videos useless as well, even when they are well-done. Besides Sheldon Brown I have found the Park Tool site to have very good diagrams and procedures, especially those describing derailleur adjustments, and you never have to stop and rewind a diagram.
https://www.parktool.com/blog/repair-help