I was going to say the same thing. The way to learn practical repair is to get broken things and try to fix them ... chances are most of them will get more broken, but as long as you're not spending much to get your test subjects, no big deal.
A wonderful way to start is to get two identical objects that are dead in different ways.
You usually can combine them to make one working one - no need to even buy parts.
A few weeks trolling Facebook marketplace or Craigslist will often get you some that match.