Put some of your StarSan solution in a spray bottle. That way, you always have some ready to go.
Cool your wort to pitching temp before adding yeast. If you pitch hot, you'll ferment hotter.
All those bubbles on the top? That's normal, don't freak out. It's called krausen and that means it's working.
If you think of it, rehydrate your dry yeast. If you forget, no biggie, but maybe try it sometime. Similarly, if you are not using dry yeast, consider making a yeast starter depending on your original gravity. And if you don't, again, no biggie. But try it sometime.
Follow established recipes for a little while before you deviate and experiment. Get your process down, that way, when you make changes you KNOW the difference is down to a change in process/ingredients, and not just due to an "oops."
If you got a Mr. Beer kit, enjoy it, and keep that little brown keg, but after the first batch ask you local homebrew shop to help with a few recipes.
THERE IS SUCH A THING AS TOO MUCH HOPS!! IT'S EASY TO GET THERE! If you are making your own recipe, use something like BrewTarget software to help plan your recipe.
I could go on. But I won't. For now.