Learn X in Y Minutes
learnxinyminutes.com
learnxinyminutes.com
I imagine if I needed to learn enough Go or Kotlin, or some other language that's not totally a different paradigm to C/Java(script)/etc, to get a superficial understanding (enough to following along a blog post or some simple snippet of code) it would be sufficient and convenient.
I used it recently to get my barings in Bash and then used the terminology I learned from the examples to finish my glue code.
Was this code good and super idiomatic? I don't think so but I also don't care. That job is done and I am on to bigger and better things.
Much like Wikipedia with regards to research, it's an overview and gives you the tools to dig deep but it doesn't really "teach" you any given language.
I’ve been programming for 15+ years, everything from assembly to the latest JS. I don’t need a $50 book for, say, C# that is targeted at everyone and so spends time explaining basic programming concepts. I need a 10,000 foot view and then I can drill down into the things that are unique or otherwise unclear.