They are many forms of energy. Some examples are elastic, thermal or heat, chemical, electrical, nuclear, sound, light, gravitational, and mechanical.
There are 2 main energies. The first one is potential energy. Potential energy is energy that is stored inside things. For example; food, apples on the tree, or a charged phone since all the energy is stored inside. Kinetic energy is energy that is in movement, for example; an airplane, someone running, playing football, a car traveling and speakers since all these have moving energy.
Energy cannot be created or destroyed, but it can be converted. An example is someone jumping on a trampoline. The trampoline is elastic energy which then it is being converted into mechanical energy. Then it is created into gravitational energy because the person is jumping off the ground. After this it becomes mechanical energy again because the falling of the person.
In conclusion this topic is really important to learn because the world is sorrounded by energy. If we know this we can improve things in the future and create new things. We use energy everyday of our lives, because of this we need to know how it works. If we know this information we can make a future a better place to live.