Computer stuff melts my brain

When I plug my external hard drives into the PC, sometimes it acts up. I'm guessing it's because I have too much junk on all my various hard drives (I'm a file hoarder u_u), so I thought maybe I should look into increasing my computer's internal storage capacity.

I'm hesitant to take anything apart since I'm still pretty new to customizing computers, but trying to figure out where you plug NVMe things into kinda started melting my brain. I was able to find the SATA ports easy enough, but I think the NVMe ones are like... behind metal panels? So I think I'd have to at least take out the graphics card to even install one.

I also feel like I can't get dust out of it. It's not like it's piled up a lot or anything, but when I look up videos and tips on how to remove dust, it feels like 80% of it is just "haha yeah you can't remove the dust or you'll fry your computer :) anyway, buy air in a can". I wound up buying a rechargeable air blower thing, thinking that'd be more sustainable in the long-term, but it doesn't seem to... do... anything...

I just really want to take the fans out and wipe them down with a rag, but I'm scared I'll break something if I do that.

Hahh... I wonder if there's like... dummy computers you can buy to practice on lmao? Like how you practice medical things on a fake doll thing before you go anywhere near a human, if there's like. Toy fake computer parts you can practice with lol

Maybe I should just unplug and replug things a few times to get over being too scared to touch it.