Whether you’re hanging shelves or breaking through a wall, you’ve got to know where to find the wall studs. There are three ways to find studs. One, sound it out. You should hear a solid thump when you hit a stud. Two, look for nails along the baseboard. They’re usually driven at stud intervals. And three, use a magnetic finding device. It will zero in on the nails or screws that fix the wall to the stud.
For more on walls, consider: