How does a rocket work and how do the fins affect the flight of the rocket?

I need to write a two paragraph essay so can you maybe summarize it into two paragraphs? Thanks!

I can't do your homework for you but I will explain a little.
The rocket's fuel pushes down and the rocket must push up with an equal force (newton's 3rd law). But the rocket is moving through air so it has to overcome air resistance- this is why rockets have to be streamlined. The fins are there to stabilize the rocket (make it go up and not side-to-side because the air is pushing it around) by keeping the air resistance equal on all sides - that's why it's good to have evenly spaced fins on a rocket, they will make it fly straight upwards.