You are welcome to sell hats made with this pattern.
American crochet terms.

An easy pattern for a traditional sports beanie. A fun hat for kids and teens or an adult sports lover.
It calls for readily available worsted weight yarn - choose your school or team colors or just your favorites. The numbers are purchased and hand sewn to the hats. You can use your child’s team number or favorite sport hero’s number.
The pattern includes instructions for child, youth and adult. The hat is crocheted from the top down so changing the size is easy.