I am a QA Tech Lead at a company that builds Magento e-commerce websites.
Looking forward to talking to more of you
Welcome to the community forums!
I guess the best way to start is to ask and try to help into the forums. You'll find a lot of information about real life problems.
Another recomendation could be to be aware of Magento issues on Github: https://github.com/magento/magento2/issues (if you are technical, of course).
You'll find a lot of information on StackExchange too, and you can start diving into the oficial documentation: http://devdocs.magento.com/ (and maybe you can help to maintain the documentation on github too)