a) Organize your closet so that you have a place for your shoes, whether it's a shoe rack or just a place on the floor.
b) Don't pile the shoes on top of each other, as that might leave dirt or marks on your shoes.
c) Create special storage for special shoes. If you have a pair of good dress shoes that you only wear with your good suit, keep them free of dust by storing them in a box or bag.
d) Clean or polish your shoes regularly.
e) Keep your shoes away from mud, wet grass, and water puddles, as that might make your shoes dirtier and reduce their lives.
f) Don't drag your feet. There's no sense wearing out the soles of your shoes any faster than necessary, so pick up your feet when you walk.