Your home has a 120/240 volt system and, depending on the size of your home, 100 to 400 amps. Every home has a main breaker than can shut off power to the entire house. The main breaker is typically outside next to your electrical meter. Removing panel covers to access the wiring should only be done by a licensed electrician. If not handled correctly, an electrical shock and an ARC flash may cause severe burns and possibly death.
It is useful to familiarize yourself with the whereabouts of all electrical panels inside and outside of your home. The electrical panel will have multiple breakers and each of these should be labeled as to what that particular circuit powers. A circuit can either power a series of lights or outlets or something specific such as a garbage disposal or dishwasher. Breakers protect the system by tripping the power if there are too many things drawing power on the same circuit. A short in the system will also trip the breaker. Tripping a breaker causes the breaker to move into the center tripped position. Reset the breaker by first going to the OFF position and then back to the ON position. If the breaker trips again after resetting it once DO NOT keep trying to reset the breaker as this indicates there is a problem on that circuit and attempting to reset could cause damage or a fire. Some outlets in your home will not allow things to be plugged in that are not aligned with the outlets proper orientation. Do not ever force something into an outlet, it could be the improper orientation or a different voltage and forcing it into the wrong type of outlet can cause damage to the device and/or the outlet.