There is an uncountable number of people who have great knowledge about bitcoin and blockchain in general. Once they join bitcointalk forum, most of us will be impressed by the knowledge shown by a newbie. However, he won't be able to write well designed posts if not being a forum user before especially that bitcointalk requires the minimum knowledge about BBcode styles/codes to develop nice posts.

In most of cases, this is the truth. As said above ; a good poster has to know what to write and how to write it. About how to write it, users should have previous experiences with posting using BBcode and sharing idea within forums and different communities.

So far to be true.