There are 3 types of potential energy. I only can figure out two:

Chemical and Nuclear!

What is the third one?

http://chemsite.lsrhs.net/chemKinetics/PotentialEnergy.html

This didn't really help! I just want to know the third one?

The third type of potential energy is gravitational potential energy. Gravitational potential energy is associated with the height or elevation of an object relative to a reference point. To calculate the gravitational potential energy, you need to know the mass of the object, the acceleration due to gravity, and the height or distance the object is lifted above the reference point.

The formula for gravitational potential energy is:

Potential Energy (PE) = mass (m) × acceleration due to gravity (g) × height (h)

To calculate the gravitational potential energy, you can use this formula and plug in the values of the mass, acceleration due to gravity, and height. The unit for potential energy is joules (J).

So, in summary, the three types of potential energy are:

1. Chemical potential energy (stored energy in chemical bonds)
2. Nuclear potential energy (energy stored in the nucleus of an atom)
3. Gravitational potential energy (energy associated with the height of an object)