Is Internet Slang Helpful For Learning English?

How do people learn English? How do you learn English quickly? Is slang a good thing to learn? Or is it a waste of time?
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[@Dareios074]

I don‘t know if I‘ll need them, but I‘ll definitely understand them if I come across them.👍

[@GustavoOliveira-qv3km]

I've read a lot of people using 'Cook', but not in the sense of cooking food, so I always get confused 😅

[@UnderstandableEnglish]

Recently I've seen that as well. For example: I'm cooked. I think it means that they made a mistake and there will be bad consequences.