Welcome to all forum members! Recently I noticed that many new members don't know all the rules, me being one of them. It's not really our fault. Because not all rules are written.
I can see that you have not been to these forums for even two weeks, so I wonder what knowledge you have acquired in less than two weeks to share with other forum members and even the newbies. But when you said all the forum members, you meant even people who have been here for almost or more than a year; you can teach them what you have gained in less than two weeks. However, everyone you see in these forums knows the rules guiding them. But only newbies like that have yet to be acquainted with the forum rules. From the first time we join the forum, we learn the rules and regulations guiding the forum, so don't say that many users don't know the forum rules.
However, anything you see that is not specified in the forum rules and regulations means that it is not among the rules, therefore I'm not sure what you mean when you say that not all rules are written there.