What are the rules for posting messages on the forum? For example, what topics are prohibited? I briefly reviewed the rules, but I didn't find anything about this.

I assume that all content prohibited in the rules is also prohibited on the forum + there are some basic rules as on every forum such as the prohibition of spamming or advertising

Just using common sense will get you far

Yeah,pretty much that,same rules that apply to the comments and the page in general apply here