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.

Half of your MARKETING budget
Westworld Season 2, Episode 2

I don't know. It's a MARKETING scheme.
The Big Bang Theory Season 3, Episode 12

But if you took advantage
of modern MARKETING techniques...
The Big Bang Theory Season 2, Episode 18

your MARKETING people
had them...
Westworld Season 2, Episode 7

and MARKETING strategy
for Inflamminex.
The Big Bang Theory Season 12, Episode 13