There is no limit to what newbies can comment, but make sure that your posts are not off-topic, make sure they are on point and not derailing thread but giving the thread to be meaningful in a way people can learn from it.
Yes that's true, making a post must be in the context of the title, if there are posts that have arguments that have a branch of discussion, do not be spurred, you only need to withdraw the discussion on the core of the context.
I think it needs to be made the main thing is not to spam in the post, because it is quite disturbing other users in this forum, and spam is also a strong ban for all forum users, at least has a post of 15 minutes or more before making a new post.