Hi am new here and I hope to learn and get information in the crypto space especially Bitcoin so how do I start posting and know which board is relevant to the topic that am talking about so i don't post in wrong board
Welcome, Mate!!!! 
Seems to me that's you spotted in a right place. It's the best place for you here you will understand how it is necessary to post in better view and what type of post is prohibited.
I think the members have guided you to understand the rules and regulations. There will be nothing left that has not been told to you. However, I will give you some advice regarding through the forum. If you want to learn knowledge in the right sense, then you have to dig deep in the forum and look out every thread that is necessary for your knowledge. The second thing is that you should be a part of the discussion on every topic where there is a scholarly discussion among large members.
Last and the most important point is that you should never be act in such a way that you are called a cheater. Means avoid spamming, plagiarizing, etc. otherwise you will be kicked out from the forum.