Tbh though, as a person going through this learning right now, the single most essential thing I did was youtube "basic bash tutorial" and watch a few videos/follow along with them. Gave me the first foothold to start climbing the cliff, made it much less foreboding.

Now I'm struggling with for loops, but that is not exactly basic and I'm blaming that on my ADHD, I haven't tried to learn in months, I'll get around to it!