The video goes into detail, but the big nugget here is about sundials. If you jab a stick into the ground to make a sundial (with the stick serving as the sundial's gnomon) in a Northern Hemisphere country like Egypt, the shadow you'd tell time by moves in a clockwise direction. That's due to the rotation of the Earth. If you made the same sundial in South Africa, located in the Southern Hemisphere, the shadow would move counterclockwise.
As clock technology progressed and moved away from sundials, the hands of a clock continued to move in a clockwise direction. That's what everyone was used to. It made sense instantly because people were familiar with the sundial. So, if anyone every asks you why clocks run clockwise, feel free to say "just because they do." You'll be right, more or less.