Learning how to swap out parts in your computer (desktop or laptop), which will eventually lead to building your own PC and save you money on incremental upgrades instead of replacing entire machines. If you've ever played with LEGO, doing this is kind of similar, only a bit more expensive (just a bit, goddamn those LEGO prices).
I found a great video on building a gaming PC a while ago, very useful for learning where the parts go and how to install them.
LinusTechTips is a great channel. Linus is funny, friendly, and approachable enough to be a pretty effective teacher regarding all things tech. I also highly recommend his companion channel, Techquickie. His video, "What is a Core i3, Core i5, or Core i7 as Fast As Possible," is something I still refer friends/family to to this day.
Yeah I agree. I've been checking out his channel recently because soon I will be building my own gaming PC, something I've been wanting to do for a while now. He is an extremely friendly and funny guy, and makes everything easy and understandable.
Best of luck to you with your upcoming rig! Don't be afraid to ask for help if you're ever unsure about any aspect of your build. /t/buildapc exists!