No such thing really - the title 'History' encompasses a really big area! Nobody knows it all!
Pay attention to what's going on around you. It's all happened before... ;)
Pretend you were involved in the time period you're trying to learn about?
Google some timelines
Why do you need to learn it really fast?
Well I know the only way I learn something quickly is that I really do have to enjoy it.
Make it up, that's what historians do.