Post as you Learn:
This is the best method to adopt as a newbie. When you learn, you create posts asking questions where necessary. By this, people will see your willingness to learn and help you to grow.
I agree with this to be the best method to adopt, besides other users seeing your willingness to learn, individuals learn faster when they discuss the topic they are trying to learn and you will also be able to correct wrong ideas you may have discovered online when you discuss it with others.
I personally learnt more about topics I made threads on than those I simply read on and moved on.
This was actually the method I used, however, it is not the best method to use. In this method, you will suffer because, some established members might mistakenly think that you are someone's "Alt Account". If this happens, no matter how good your post would be as a newbie, those people will not merit it, they will think that it is one Hero or Legendary member that is behind the account.
I do not think 'some days' is enough time for a newbie to post like a veteran on the forum, you'll only show knowledge on the basics of the forum and other topics that have interested you. I can however understand how an account could be mentally tagged to belong to an older member, but this shouldn't matter much down the road if the account keeps posting useful content and keeps to the rules.