The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Left 4 Dead, yo. Bitches get all
cranial when you CAP them
in the head. lt's like, "Booyah!"
Breaking Bad Season 4, Episode 2

...to pop an emotional CAP
in his buttocks.
The Big Bang Theory Season 2, Episode 9

Where a baseball CAP backwards
to prove your point?
The Big Bang Theory Season 11, Episode 15

Cap and gown?
Why do I need a CAP and gown?
The Big Bang Theory Season 8, Episode 22

So I fling the hose, I'm grabbing
the CAP, I'm screwing in the bolts.
Breaking Bad Season 5, Episode 11