@59034767 Indeed. Check out Stack Exchange, https://stackexchange.com/ . It's a collection of sub sites that do this for different topics. The original one was Stack Overflow, which was for coding. It worked so well that its creators decided to expand to lots of other topics. 

 @f915ade0 

Totally — I’ve used the original stack overflow myself for years, and dip into several of the stack exchange forums too, for things like math and physics… They’re amazing