Are you talking about Bitcointalk in general and how to be progressive in it? Or are you talking about how to grow in the Bitcoin community?

For me, this forum is a place to learn, to teach, and to earn. These are the three most important things I find about this forum, and I have been doing them. It's not compulsory for you to always contribute to the forum if you don't have anything important to say, because you actually want to contribute to a discussion. This is among the things that lead people to plagiarism and word spinning. No one actually cares about the next person's grammar if it's correct or not; what matters is that you know what you are saying. English is not your mother's language, so you can only do the best that you can; you can't be perfect in everything, so don't take the forum as something that's a do-or-die affair; just do you and be you, and that's okay.

Then for Bitcoin, yes, the Bitcointalk Forum is the perfect place to learn about anything concerning Bitcoin, its development, core updates, and everything in general. It's not as if you can't learn outside here, but here gives you the right opportunity to ask questions where you are confused, and you will get responses from people who are experienced in those fields, those who are learning, and people who are just sharing ideas based on assumptions, but in all ramifications, you will end up getting your desired explanation from an angle that you have been expecting it from.