Through two weeks'studying,I have some questions .

Frist,how can I find the difference between “b” and “p”.I think they are too similar,so I make some spelling mistakes.

Then, the “rr” pronunciation is too difficult to say.

Last,in some sentence,there are some words like “a” “le”.what's meaning ?How to use them ?

Looking forward to your reply .THANK YOU VERY MUCH !