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The key here, post when you are highly knowledgeable or even experienced about the topic, but if you’re not, don’t act as if you know it but just skip on it, but learn from it as well.
That part where you advised that people should contribute only to discussions they're conversant with and not pretend about it if they didn't know anything there, it's a good one. However, sticking to that will be really difficult for members who want to cover many sections of the forum so as to meet up with spreading out their posts so they can get their weekly pay from their various campaigns. At the end, they spam there rather than make meaningful contributions.
I believe there's a lot I still need to learn here and most of the time I just to my spare time to go through threads and replys from the various threads I come across. I will read just to learn and not say anything regarding it because I'm still learning. Some said merits are earned and not given, I have come to understand that statement even more.