How Do Chemical Rockets Work?

So every time you turn on your headlights, your car slow down the tiniest little bit. And it just made me think, when you hit the brakes and you turn on the brakelights in the back. Y thanc. Yes, brake light should be in the front o my god, so uha ha ha he i think that would defeat the purpose of braklights. So pretty quickly, this is sort of like a runaway mass problem. You need to have a really, really big ship to get anywhere at all,. Because you need fuel to push all the fuel that you're pushing with, all the fuel ray.