Energys are split up by scientists into nine fields:
Phew! Any of those names ring a bell? The only one I had heard of was electric energy! There's another 8! Let me explain a few of the less obvious ones. Chemical energy releases it's energy when a chemical reaction takes place. Example, in food, you get energy because a reaction has taken place between the food and a enzyme in your mouth called amylase. It is this reaction that gives you energy.
Gravitational Potential energy is an energy gained due to the relative position of an object. Example, a ball would gain heat energy (heat up) if it were placed in the sun. Many people freak out when they hear long words like that, but it really is that simple!
Remeber, if you have any questions, please leave a comment!