I think that one of the misconceptions that Columbus had about the world is that it was flat when as we know now it's very much not. I hope this helps :)
The best way to shoot a picture would be to have it center screen. You can look through your viewer as well as long as your subject is the main focus in the middle.
The primary colors are red, yellow, and blue.
They are called primary colors because they form other colors when mixed together. Other colors cannot be mixed to form primary colors.
