I study english and I’m interested in some UK and US slang that you use. As many examples as possible. With explanation preferably but not necessarily. Feel free to write sentences with these slang words as well.

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It depends on where in the UK, as they all have different slang. In England, the most common would probably be:
Knackered - tired
Quid - Pound coin ££
Mate - friend
Fag - Cigarette (Try not to mix this one up. 😂)
Bants - Banter, which is a form of humor.
Gutted - Upset

I am in Scotland, and some of the slang we use is the same in England, but we have our own as well.
Wee - Small
Wean - A word for a child, for example, “Look at Sandras weans!”
Aye - A way of saying yes, for example, “Aye mate!”
Dafty/Numpty - A word for someone who’s acting like an idiot.