Thecuriousone

Hi I am just new so please pardon me if i insulted any of you or your intelligence. Anyway, i am just starting to learn relativity and i know some theory behind special and general and maybe some mathematics like Lorentz transformation. Anyway, how can i learn general relativity as in their maths as i always hear about the challenges faced in doing or maybe understanding the mathematics behind some of these theories. Any help or tips will be kindly appreciated.