The correct way to write your question is: ما هو الفرق بين العامية و الفصحة ؟

العامية هي نفس اللغه العربيه ويمكن ان تسميها لهجه كما بالانجليزيه هنا عده لهجات واحيانا تكون العاميه لا تكترث بقواعد اللغه من نحو وصرف. أما الفصحي فتهتم بقواعد اللغة

There is a difference between the 2 ,, also there is a difference between the Arabic country , each place have specific slang ,,, so i advice you to learn standard Arabic first , and the rest will come with the time

there is a big difference between the standard Arabic and the dialects. in the dialect we use many words which doesn't exist in standard Arabic,the pronunciation of some letters and words is different too.the grammar is not very important in the dialect. we don't use standard Arabic in daily life,standard Arabic is Just used to read books and some programs on TV. hope that helps:)