Très
First meaning: very
Allows you to emphasize something, whether it is a good or a bad point!
e.g.:
Ça va très bien et toi ? (I am all good, and you?)
Ton devoir est très mauvais. (Your homework is the worse ever)
=> In these sentences, “très” can be replaced by “vraiment” (“really” in the sense of “so much”).
Trop
First meaning: too much
Is used to express something excessive like if you’ve reached a limit. The sense can be negative but not all the time!
Indeed, in daily life, especially when people talk, “trop” is used to sound cool.
e.g.:
J’ai trop mangé, ne me resservez pas, merci. (I am full, I will stop here, thanks)
Il est trop mignon ! (He is so cute!)