Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
If you want to help answering questions that haven't gotten enough attention, you can use this query to find such questions. It lets you filter questions by tag to help you find questions you know how to answer.
If you program in Javascript and want runtime type checking, you can use Typecheck.js.
Here are some Meta posts that I particularly agree with: