This is a discussion on Horse Care Information within the Horse Health forums, part of the Keeping and Caring for Horses category; What are your favorite books and/or websites on:
Nutrition
Hoof Care and Shoeing
First Aid
Stretching
Horse Psychology and Behavior
...
Some of the best websites out there for first aid and preventative care are university or veterinary society sponsored. Here are a couple, but you can do a search for more.