The most frequent sound effect foley artists produce, are footsteps. This is due to the difficulty in capturing good quality walking sounds during filming.
Foley artists consider multiple elements when they are working on creating footstep sounds like the kind of shoe being worn, their weight, speed and personality in walking as well as the surface they walk on; walking in the rain is different than walking on a wooden floor or walking on snow for example.
Here are some ways you can create footstep sound effects: