Thank you, I enjoy checking various topics on bitcointalk. Benefited me a lot.
For the topic of Bitcoin technology, I especially want to participate in the discussion, but I don’t know much about technology, and I have to learn more.
While there's no defined groups, really. If you participate in certain sections, you'll usually see the same users posting, and participating in discussions. For example, the Development & Technical Discussion is a rather concentrated group of users, compared to the rest of the forum, with only occasional new users contributing to that section. If you want to learn more about Bitcoin, then stick to the Bitcoin sections. Development & Technical Discussion usually has the more in technical side of things, while Bitcoin Discussion has a much more, for a lack of a better word, relaxed approach. At least in general.
If you are looking for private groups, sometimes users will make private chats, and invite you, but you generally have to be pretty established for that to happen.
Yes, I have observed many legendary users staying in the forum for many years. After so many years of communication, there is a high probability that they will become good friends with each other.
As a newcomer, of course, I also want to make a few newcomers friends to grow together in the forum, but I am not sure if the other newcomers are alt accounts or for bounty. I decided to plan to make friends on the forum when I got 100 merits