Ask HN: Is Answering Questions on Stackoverflow help us to grow in our carrier?

Sorry if this sounds snarky. I'm not a grammar nazi and make spelling mistakes all the time (I just got grammar wrong). But looking the the wording of your title, the best way to help your career (or any career) would be to become more proficient at English.

This is also assuming that you are/want to work in an English speaking country.

Don't worry too much. You answers will be modified. Questions will be changed or blocked (so no one will be allowed to answer). Just because those people "who love answering questions" will know better. They even know if your question is a question.

I think you'd better have a blog. This way you can answer the questions you find e.g. on SO, but no one will change your answer.