How does friction affect all moving objects?

It usually slows them down

Friction always robs some kinetic energy from the moving object and converts it into heat. It keeps doing this as long as the object continues to move. So the object continuously loses kinetic energy, slows down, and eventually stops moving.

This is what we see everywhere around us, every day of our life. If we were to write a scientific law that describes everything we see, the law might be "A moving object, with no force applied to keep it going, eventually stops."

THAT's why it's so hard to even understand Newton's first law of motion: "A moving object keeps moving at a constant speed, as long as there's no force applied to it to make it slow down or stop."