How to create rest api in magento 2

Thank you for the explanation, may you kindly share this code please?

the code is not understandable, the way you explain is worst!!! dude, upload example to github or something.... haha
i'm putting a thumb down to this video...
worst explanation ever.

Thank you for this...Can you share the code?

Kindly share the code brother

Please share the code

api code link