I wanna learn slang do you know any good expressions?

Probably the best way to learn slang would be to watch English television or movies and then inquire about the meaning of phrases you don’t understand. For example if you heard a conversation like:

“Hey man, let’s roll”
“Alright, I’m down, where are we going.”
“Let’s bounce to Chris’ pad.”

You could just ask what these things mean and it might be more helpful. The main reason being that there is just so much slang that native speakers take for granted and don’t realize it is slang because we use it so often.