I would like to know basically how posting is best made here.
Depends on how much activity you can give to the forum or in other words, how much time you want to "waste" on this forum.
Is there a limited number of post per day?
Based on rank, yes. I dont like to spoonfeed people so you have find that out yourself. Check the different stickies in Meta and you will get an idea.
What are the do's and donts regarding posting on this forum
Do not post just because you have to post or to increase post count. Post because you have something meaningful to say or add to the discussion. We dont want shitposters. Period.