There is set of things called RULES:  https://bitcointalk.org/index.php?topic=703657.0
My other general advice is: Don't do things you don't want others to do to you.

some hints:
Don'ts
no spam, no reflinks, no useless posts, no double post (search before making own), don't try to scam others, do not promote scam schemes, don't try to buy trust, when making a deal use escrow, don't beg ...

Do's
help others (if you can), contribute to community, be polite, watch and learn, ...

Enjoy your stay.