Welcome to The Workplace SE. As others have mentioned, we're not a traditional forum. Instead, we're a Questions and Answers site. The major difference is the focus on answers, not discussion, and the result is a wealth of knowledge, without the noise generated by discussion, which can be searched from major search engines.
To learn more about how this site works, please take the tour and check out what we consider on-topic and off-topic on this site.
The biggest benefit you'll get by contributing answers is that you'll learn. Answering questions will force you to think about the problem on a much deeper level and formulate an intelligent, quality answer which will last for years to come, helping future visitors to the site. Hope this helps.
As far as I know, there is no site to highlight your contributions to Workplace SE, but I imagine one could experiment with putting this in their CV or resumé, if it's applicable to the job they're applying for.