The Karma Theory

I can see that the choices I make and the things that happen to me are related in some way or the other. What is that way? I don't know but the only possible answer that I've got is The Karma Theory. The karma Theory is derived from the Bhagvat Gita. I don't know How correct is it but one thing I know for sure that it can't be completely wrong. It seems that as life goes on the situations I experience are urging me to believe the theory.