Time travel

So I'd like to travel in time but lack any grounding in physics etc

I've been doing some research on the internets and wondering if I should take some courses at uni or something

It's possible to go forward in time, all you have to do is travel close to a black hole, I've heard; as you're pulled in by the black hole time will move slower for you. I can't remember exactly why though, for the life of me. Sail away from the black hole, and you've jaunted forward in time.

We'd need a spaceship that can survive this though.

Going back in time is impossible as far as I can see.