Have you ever seen a football game, and seen a shot swerve and dip? I will explain how it moves like that.
Firstly a football curves because of a phenomenon called the magnus effect,the magnus effect happens when a spinning object moves through a fluid, a lift force acts on a spinning object and its path might be changed in a way that doesn’t occur when it’s flying straight.
Secondly the air flow makes a spinning ball curve because the spin changes the speed of the air flowing around it. If you kick the side of the ball with the side of your foot it will create a pressure difference which makes it curl.
Lastly if you want to learn how to curve like a pro then you can try swiping the side of the ball with the inside of your foot on the side of the ball. You can also just watch some YouTube videos, but the best advice I could give you is: PRACTICE PRACTICE PRACTICE!
In conclusion a football curves because of the magnus effect so there you go that is how a football curls.