~ The purpose of bitcointalk is to share knowledge of cryptocurrency across each others
This is correct, as Bitcointalk is a forum for engaging in meaningful discussions that add value to the forum and its members who are interested in learning, regardless of their ranks. There are several boards available in the forum covering a wide range of topics from which you can learn. Simply choose a board that suits your interests and engage in discussions there.
~ Having earning in mind to register in bitcointalk will make you as a Newbie not to know the advantages and disadvantages of bitcoin
There's nothing wrong with coming here to make your first Bitcoin. This forum offers a wide range of opportunities. First, you can gain enough knowledge and then try to share and help others. By doing so, you can rank up and later on explore ways to earn some money through signature campaigns or even by starting a business in the marketplace. There are plenty of things you could do.
~ Don't be conscious of merit but understand the system of making quality posts
This is really important. Seeking merits won't be the best approach here. First, learn how to make constructive posts of good quality. Then, you won't need to ask for merits because you'll normally receive them without even asking if you posts are good enough.
~ Engage in a conversation mostly related in bitcoin.
This is obvious tho; it's Bitcointalk so yeah we are talking about anything related to Bitcoin.