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The priority of this forum is not exclusively earnings, but spreading knowledge about Bitcoin and discussing the ecosystem that accompanies it. So this is not a "get Bitcoin" platform and whoever presented it to you like that has the wrong picture.
Of course, there are possibilities, but before that you have to familiarize yourself with the forum itself, in time you will understand what opportunities it offers. So, learning is the best advice for you.
Joining the Bitcointalk forum can help you learn more about Bitcoin technology, Bitcointalk can also be a place for business to seek profit from activities carried out in the forum. If the motivation for joining the forum is only to make money, it is very difficult to do because of limited knowledge, but if the goal is to seek knowledge by utilizing all the information that has been spread in the forum, then both can be obtained. It takes time, process and knowledge to earn income on forums.