Move the emery board in only one direction. Cut your toenails once a week. Cut toenails when they are soft from washing. Cut them to the shape of the toe and not too short. Do not cut into the corners because you might cut the skin.
Sharp edges can make a sore that can get infected.
File toenails with an emery board. If you cannot cut your own toenails, ask someone who can or go to a foot doctor. Always wear shoes or slippers. Never walk barefoot, even when you are at home. Always wear socks or stockings.