Language / Prepositions in the Polish language. [16]

Hi,

There are so many prepositions in the polish language.
Etc: you have at least to words meaning at: "Przy" and "U".
And when your going somewhere you sometimes use "Do", and sometimes "Na".

Can anyone write most of the prepositions and explain how we use them? with some examples ? :)

And when you say: "I play football", its "gram w pilke nozno". why is there an "w"?

Also, is this sentence correct? :"Szkoła konczy czerwcem" - School ends in June. ?

Thanks alot :)