I also suggest you look around the site. In addition to the menus and links at the top, there is also a lot of links at the bottom that can be helpful.
One thing you need to do in here is interact with people. Ask a question and respond to people who answer you. Post answers (to earn points) and follow on questions posted back to you.
Experts Exchange is a collaborative community of technology professionals!
We facilitate collaboration, learning, and problem solving through conversations and content in more than 230 technology topics.
For example:
How it Works https://www.experts-exchange.com/howItWorks/
Support http://support.experts-exchange.com/
Some of the Support articles and pages might be a little out of date but there are many that are helpful on some specific ways to use the site.