The height of a professional basketball hoop is 10 feet.
So if you want to practice playing professional basketball you should set your basketball hoop as high as 10 feet which is where they are set at for professional basketball players.
If you get good enough at playing basketball you might even be able to earn a lot of money playing basketball as a professional basketball player.
But if you're just playing basketball at home then you can set the basketball hoop as high or as low as you want too.
The basketball hoop ring is also 18 inches in diameter.