Wikipedia:No fixed rules

This is an essay.

It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.

"If a rule prevents you from improving or maintaining Wikipedia, ignore it",. see WP:Iar
You do not need to know the rules before you contribute. -*- see * at Wikipedia:What "Ignore all rules" means
Wikipedia does not have firm rules, but you might like to read Wikipedia:Five pillars.