Erus

Ok, I have studied somewhat General Relativity yet it hasn't fully answered a question that keeps popping up in my head. Though it is probably easy to answer, yet hasn't been comprehended by me. The question is on Space curve caused by dense objects in space. I will ask as simple as possible and hope you all can answer it for me..

What governs the direction mass and density sink into space?

I may be off track completely and not getting general relativity, but this question is bothering me and if I'm not getting it I would like someone to explain the answer so I can understand lol ty