[casefexas]

You need to be careful while watching lectures and reading stuff from the 'internet'. Make sure you follow the scholars of mainstream Islam. I can help you understand the correct history after the Prophet if you want. If you are willing to take the effort, I shall post the links of the books on the history of the first four rightly guided Caliphs.

of course i want to know , but only authentic sources , in which thre are no fabricated history ,, send me some links of books as well as website where i can get authentic knowledge