Language / Polish Case System [32]

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Polish Case and Case use?

I took an interest in teaching myself Polish for around 2 months now.. I know the Alphabet and how to pronounce things dicently correct. But there is just one thing that seems to be bothering me a little bit. The Cases.

I know there are 7 Polish Grammar Cases

Nominative, Genetive, Accusative, Dative, Instrumental, Locative, Vocative

It just makes me wonder, how do you use each case?
I attempted ALOT of research on Google. But no luck.