There are three types of levers: class 1, class 2 and class 3.
There are three main parts: point of support or fulcrum, resistance or load and force or effort
Class 1 lever:
The fulcrum is in the middle. It is between the force and the resistance.
Examples: Scissors and pliers
Class 2 lever:
The load or resistance is in the middle.
Examples: wheel barrels and nutcrackers
Class 3 lever:
The force or effort is in the middle.
Examples: stapler and tweezers