You may see people (including me) using words on here that are short for the real words. I will post most of those that I know of so the comments and posts won't confuse you!(:
Lol= laugh out loud, Rofl= rolling on floor laughing, U= you, Luv= love, K= okay, Sup= whats up, BRB= be right back, Cus= because, c= see, 2= two-too-to, goin= going
That's all I can think of so yaa! HOPE THIS HELPED:)