Linux

Understanding what different distros offer and being able to make a educated decision about it. I looked around for a week or so until I found a arch distro that worked, took away the manual installation process as a complete noob, and wasn't all red flags straight away (the example is that a lot of ppl advised against manjaro). I ended up with garuda (which some ppl aren't a fan of because of chaotic-aur, but we have to start somewhere, haven't we) atm which works fine until I am confident enough to do a complete base arch installation the next time.

Getting some specific thing to work

It's still software support. Yes, there are many great alternatives, but not being able to use apps like everyone and not being aplble to keep the apps you have is just too complicated for many

Many comments here largely underestimate an average non linux user.