The best evidence I can give you is your own senses. You can't see any curvature and you can't feel any spinning. You can't find curved water. You can't see or detect gravity. In other words, there is nothing about the world we live in that your senses would lead you to believe that we live on a spinning ball. But humans have been observing the bodies in the sky and theorizing about what they are and why they act as they do for all of history, which have given rise to the ball earth idea, among others. In other words, it is an entirely intellectual endeavor. But you take this for granted because you have seen pictures and the people that you have trusted tell you it is so.