What would be a good camera for me?

Hey everyone. I am looking to buy a camera as a step up from my moderate/low quality point-and-shoot Samsung. I enjoy photography as a hobby but I don't have much experience so I would need a camera that is kind of easy to figure out. I'm not looking for anything to fancy, it would be mostly used at horse shows (so it has to take good "action shots") and it would also be used for scenery. My budget is $300 and under and I am willing to buy used. So does anyone have any advice on what camera would be good for me? Thanks!