The methods involved in fixing a hole in the wall can vary. It all depends on whether it is an actual hole in the wall, a nail pop, or a tiny dent. Let's start with learning how to fix the tiny dents.

Tiny Dents

• Remove loose debris from the hole and surrounding area. 
• Cover the hole or dent with fast-drying spackle.
• Let it dry for the time recommended by the manufacturer's instructions.
• Sand until smooth.
• Finally, touch-up the area with the hole with the same paint used on the walls.

Nail Pop Dents

• Screw-in a drywall screw 1 1/2 - 2 inches above the nail pop location. (This is to reattach the drywall to the stud)
• Sink the screw head to be right under the drywall's surface.
• Drive in the nail with a hammer.
• Cover with fast-drying spackle.
• Let it dry for the time recommended by the manufacturer's instructions.
• Sand until smooth.
• Finally, touch-up the area with the hole with the same paint used on the walls.

Medium Sized Holes

• Cut a piece of drywall into a square around 2 inches larger in diameter than the repair area.
• Score the drywall backing with the cuts about an inch from each side.
• Snap the score marked parts off while leaving the paper backing intact.
• Hold the patch over the hole and trace around the drywall square. Don't include the paper backing in your transfer.
• Cut out the traced square with a drywall saw. 

• Apply joint compound to the back of the paper border.
• Fit the drywall square into the new hole. 

• Press the paper edges coated with joint compound in place along the outside edge of the new hole you made.
• Apply the mesh patch over it to hold in place to the wall. 

• Cover the entire patch with joint compound until the lines are camouflaged, feathering out the edges of your joint compound application.
• Wait till it dries.
• Add another coating of the compound.
• Wait till it dries.
• Sand until smooth.
• Finally, touch-up the area with the hole with the same paint used on the walls.