I think that would be a great foray, yes. If you understand how to poke around the filesystem (cd, ls), manipulate the filesystem (cp, mv, rm, mkdir), how to search (find, grep), and how to edit and save a file (vi/vim {yes there are a plethora of linux text editors, vi is ubiquitous, which is the only reason I learned it}) you’re in really great shape.
The best part is, you can learn this subset of tools in a day, a week at worst.
There is nothing linux-specific in this list, you describe learning UNIX and could do it on any *BSD, including macOS. I would agree that knowing you way around unix is very helpful, having some specific linux knowledge is worth very little if your job does not consist of managing linux machines. And even then you will require a lot of distro-specific knowledge.
My youtube recommendations on my laptop are just short videos(all are below 3 mins with a few exceptions ;-;)
I get so much better recommendations by using youtube tv but it sucks that they don't let us switch preferences. But well results in me spending less time on youtube so a win heh
This is the first time I'm seeing a comment section that uses ssh for submitting comments which is pretty cool! I think it'll be a nice addition for any blog (along with a moderation system probably)
I use Audacious since it has a nice Qt interface and comes standard with my distro, but yes, the closest thing to foobar2000 in Linux would be DeadBeef.
While I agree that getting good sleep is necessary, I think the book does tend to over exaggerate the negatives. Alexey Guzey's article on this[1] is excellent and I recommend everyone to give it a read.
I'm not sure whether he's gone back on any of the specific criticisms he made, but his overall attitude towards sleep certainly seems different to before.
[1] - https://github.com/bryanpkc/corkscrew