Hey i could use some helpz

Hi! I want some help and i think you might have the awnsers!
1: I have downloaded some stuff, and i have put them in addons, but they are pink n’ black
2:My game craches alot! And its not cuz of my computer!

For one, that usually means you are missing the texture. Check if whatever you downloaded requires another Source game. Alot of maps and models require CSS.