Um, here are some things you should know.

Idk = I don’t know

lol = laugh out loud
brb = be right back
lmao = laugh my as* off
btw = by the way
bc = because
rn = right now
Np = no problem
ppl = people
stfu = shut the f*ck up❤️ (my favorite words)
idgaf = I don’t give a f*ck (another one of my favorite words)
did = I don’t care 🙂