Agree with this. Lately I've been watching more youtube videos about programming than usual, but I still find they take so long to get anywhere. The 5 to 10 minutes you spend watching one could almost always be spent reading an article or a chapter of a book on the same topic and getting much more information out of it. And it turns into practice for reading documentation about things that have no videos about them, which is its own skill.
Yes to reading documentation - there seems to be a trend on twitter these days of "I've been using this language/library for years and I just learned you could do X!!!". Really, you haven't RTFM on the tools you use daily to make your living?
I've also found reading the source for libraries you use and stepping through with a debugger is really the best way to understand them. This is probably how most people learn their in house code at work. Just treat the whole stack like in house code (within reason). And reading code is also a fabulous skill to hone.
Reminds me of a friend of mine at university who started to shout "YES I'M A FUCKING GENIUS" when he found out there was a split() function for strings.
