It feels odd to even mention this site since I use it so often, but I still meet software developers who have never heard of Stack Overflow.
“Stack Overflow is a question and answer site for professional and enthusiast programmers.” I’ve asked and answered a number of questions on the site, and it’s my go to place on the web when I have a software development or programming question of any kind. When I see Stack Overflow in my search results, it’s usually the link I click on first.
Here’s a link to my profile if you want to see the kinds of questions you can ask and get answers to.