Reddit mentions of Reflections on Relativity

I really encourage you to try and study special relativity. Basic relativity does not involve math beyond algebra and your misunderstandings about relativity are very basic.

As for the black hole stuff, as far as I know there is not "infinite" gravitation. When the Einstein field equations are solved for you, black hole physics becomes pretty simple also. "Infinite" accumulation violates the second law of thermodynamics, and I'm pretty sure that's why Hawking radiation is emitted by black holes. It has also been theorized that black holes have corresponding white holes which expel matter at the same rate. That seems really far-fetched to me.

Edit: Check out this chapter of a book called Reflections on Relativity. It's a pretty good book, not extremely advanced either.