Also, if you need some "general information about horses", it means you probably aren't experienced enough to have one. I'm not trying to be rude, and that previous comment probably sounds harsh, but you need "more than a little info about horses" to be able to safely ride, feed, care, groom, and handle one. I'm only saying this because horses are delicate creatures who need carefully planned diet and exercise and health care. A lot of people but horses on an impulse, thinking they can just keep the horse by itself in a backyard and feed it grass clippings. A lot of people also think riding is simple. It's not. It's a very complex sport. And VERY expensive. Veterinary care (including vaccinations, checkups, and emergency visits) can range anywhere from $300-$8,000 and very often they cost more if your horse needs special care. Good quality Hay and grain are also expensive. Not to mention farrier visits, buying tack, riding lessons, etc. is also very costly. Don't buy a horse on an impulse without knowing anything. A horse needs much more complex care than a dog or a cat.
Best of luck