Welcome! Read and read though the threads, it will widen your knowledge about btc, believe me there are still things about btc that you will learn from here, you won't even expect it. You will learn a lot and it will never stop. If you are thinking about how will you contribute, don't worry, if you already had the knowledge, you can answer questions and provide quality posts to the threads. It will come naturally. Enjoy reading and learning, and if there's a topic you can really answer, do it, as long as it is really informative. The best contribution here is sharing your knowledge.