So I have a problem, I dont know which video cards are better than others and I dont know what computers they are compatable with. If you could help me that would be awesome thank you.

It depends on your hardware configuration. Make a pc keeping in mind the card u wanna use. The latest cards have high sys requirements which is usually mentioned in their manuals. so go through that and you will know which card u can use. Also its very important to have a supporting PSU for the card.