What is the basic difference between shia's and sunnis?

Not limited to that, majority of Shia believies that Quran ( the copy we have) is fabricated (Noori Tebrassi comes to mind, he is burried next to Hazrat Ali (RZA)), some believes that goat ate the quran and some ( who consider them modest) says a 6 year old boy ranaway with Quran and yet there are some who says while compilation of Quran, Ali (RZA) told muslims that the one they had is good enough for them and he kept the original copy of Quran!!!

Now all these are either contradictory to the word of Allah all Mighty or it in a way insult Sahaba (RZA) and Ali (RZA) aswell… most often Shia claims things which in reality insult the very Imams shias.

As far as the difference is concerned, there were two groups who parted their ways from mainstream Islam, one is Kharjies and others are Shias…