Well, Answer websites become a tertiary site after Google and Youtube to get help with. It has number of benefit. Let Me break this below.

1. You are able to answer on the topic you are working or passionate about.
2. You can learn new things from reading someone other questions and its answers you are unaware about.
3. By answering to someone question you get a chance to write means a step towards being content writer.
4. Create a good profile so you can get visibility later you can convert those relevant traffic into profits.
5. Buliding quality backlinks for your sites and many more options and usability is there for answer’s site.

Hope I am clear enough to clear your doubts.

AMCOFAB