The rules here are pretty brief
a) don't spam
b) be polite, we're all volunteers here
c) we don't do your homework for you, we help you do your homework yourself
d) we use English here. Some helpers may speak other languages but in general we speak English.
e) please give the helpers a break regarding posting clear questions. Don't make us rotate your images, don't make us have to try and decipher illegible writing. If you're going to post lengthy mathematics please look into using LaTex.
f) be patient - there is no "staff" here, helpers will answer your question (or not) when they get to it.
g) don't post a question multiple times or in multiple forums.
h) please keep it to one or two questions per post.
i) you are much more likely to get a response if you post the work you have done on the problem and explain specifically where you are having trouble.
pretty much just common sense.