If you're planning on doing any work to your home that involves drilling into walls, it's important to know if there are wires behind them. The best way to find out is to use a stud finder. Stud finders are tools that use magnets to detect the nails or screws that hold drywall in place. By finding these metal fasteners, you can avoid accidentally drilling into electrical wiring.
To use a stud finder, simply hold it against the wall and move it around until the magnet detects a nail or screw. Once you've found a fastener, trace along its length until you reach an edge of the drywall sheet. This will give you a good idea of where the studs are located so that you can avoid them when drilling.
Of course, even with a stud finder there's always a chance of hitting a wire. If this happens, stop immediately and call an electrician for help. Trying to fix the problem yourself could be dangerous and cause further damage to your home's electrical system.