They say that helping others can also improve one's own learning. Partly for that reason, partly altruistic and partly as another avenue to pick up useful tips, I joined a SQL Facebook group a few weeks ago.
I figured I'm not at the level to be able to contribute much here... yet, with the august, hardcore, greybeards watching threads like hawks, ready to pounce and impart the wisdom of many decades 😀
I really regret it. If you think the questions here can be bad.... has anyone else ever looked? The best questions appear to be a context-free one-liner and maybe a grainy photo of a screen, or handwritten query/exam question/homework/interview assessment question.
On the other hand, it's done wonders for the inferiority complex I've developed reading some of the threads here!
"Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it. When we enquire into any subject, the first thing we have to do is to know what books have treated of it. This leads us to look at catalogues, and at the backs of books in libraries."
— Samuel Johnson