it takes a month or a week to perfect your posting style. You need more knowledge about your topic in order to perfect your Thread but there's a Time you've mistakenly your grammar or your word even if you are already a master poster .
This is subjective. Some can improved their posting style for a very long time. Aside from composing a few sentences, then we should mind if we are writing in a good manner or perfect grammar. There are some who dont fluently can speak on english but thats not a problem cause developing skill can be attained by means of studying and practicing. Learning perfect rhythm on writing can be harness. Forum users should be aware of that so others might not get a different meaning to what we are writing that could lesd to misunderstanding.
But if its takes time then better to write off on our local section first to express the idea we wanted to share and impart. Then later on go outside that local section for more interactions.