Depends on your size, health (are you an old lady with no grip strength?) and purpose. Go simple. 3 main paths: pistol, rifle, shotgun. Assuming you want a self-defense weapon and have 0 training or practical experience (because you're asking on Voat for advice, you stupid), I would recommend either a pump shotgun or a rifle. Pistols are too easy to accidentally shoot yourself, and we've already established you're a stupid. 12 guage shotgun ammo is everywhere and good options exist for self defense. You also don't need "as much" training to hit something if you get defensive shells with some spread. Lots of pump options for less than 400. Stay away from semi automatic for that price. If you can afford it, a rifle is a good option. Assuming you figure out how to run it, rifles are more accurate in use (longer sight radius etc etc) and you'll be less likely to accidentally point it at something you don't want to shoot. Also, kids are less likely to be able to pick it up and shoot themselves if your dumb ass ever procreates.