Use a stud finder and move it slowly across the wall
Mark the edges when the device indicates a stud
Measure 16 inches from the first stud to locate others
Tap the wall and listen for a solid sound instead of a hollow one
Look for electrical outlets, which are often attached to studs
Check for nails or screws in the baseboard or trim
Use a small finishing nail to make a tiny test hole if needed
Verify the stud by confirming a solid resistance when drilling or nailing