Sol 3 or book blog

I read a couple books on Physics, and in particular relativity dealing with time. Time, is, very odd, as I could go near the speed of light for a couple hours, only to return to earth and see that years have passed. Also, time can dilate due to the presence of large gravity. In the movie Interstellar, which is mostly based on actuality, we see Cooper, try and survive a black hole, only to find his child now more than 100 years old. Literally I do not know how any of this works, I am probably going to read all these books again because I think they should cover it somewhere but honestly I am lost in knowledge. You all out there should read or just in general learn about physics because it literally is everything.