Welcome to the Cantna, sleiman. Nice folks around here for the most part, though some have atrocious senses of what they call "humor". Just don't fall into the water during a feeding frenzy.
Otherwise, kick back, pull up a chair round the cracker barrel and join in. Just be advised that it's best to label your opinions as opinions, and facts as facts since there's a bunch of folks round here who really have been there and done that. On just about any subject.
As to how to treat others, the Nepali greeting "Namaste" ( or "I salute the god within you" ) is about as good a guide as anything. Or "Ubi caritas et amor, Deus ibi est." Translates roughly to "Where there is charity and love, there also is God."
BTW: teasing is expected - just so it doesn't draw blood most of the time.