Use a stud finder and move it slowly across the wall
Tap the wall and listen for a solid, less hollow sound
Look for electrical outlets, which are often attached to studs
Check for nail or screw heads in trim, baseboards, or drywall
Measure 16 inches from a known stud center to find the next one
Use a small magnet to locate drywall screws or nails
Verify the stud location by drilling a tiny test hole
Mark the stud location with a pencil once confirmed