Arduino binary count with LEDs

using the Paul McWhorter teaching videos I've started my Arduino learning journey.

in his fifth tutorial he talks about binary numbers what they are and how they work, and this project is the Homework to make a program that counts up from 0 to 15 in binary and using four different LEDs with appropriate resistors.

It's an interesting step In the journey for sure and Paul makes it simple and straightforward I can't highly recommend it enough.

my goal is to use this for using programming with RC airplanes and have interesting night flights.