To hang most lightweight objects, such as small pictures:
Step 2: Place a picture hanger flat against the wall and drive a nail through the hanger.
To hang medium-weight objects, such as large pictures:
Step 1: Buy plastic or nylon wall anchors made for the size screws you have, and examine the package to find out what size drill bit to use for the holes.
Step 2: Drill a hole in the wall to accommodate the plastic anchor.
Step 3: Tap the anchor all the way in with a hammer.
Step 4: Insert the screw through the item it is to hold, and then turn it into the anchor. The screw will expand the anchor to make it grip the sides of the hole.