Imagine standing on a chair, and jumping off of it on to the ground...  

As you stood on the chair, you are at a higher elevation compared to the ground beneath you. This difference in height gave you "gravitational potential energy" (will be referred to as GPE from now on). As you jumped off the chair, this GPE was converted into "kinetic energy" (will be referred to as KE from now on) as you approached the ground. 

Since you are affected by gravity (assuming there is only a downward pull of gravity), GPE is stored in you due to the fact that you are at a higher place. GPE increases with height.

KE is a form of energy present in every moving body. With reference to the scenario of jumping off a chair, this energy comes into existence thanks to the GPE converted at the start of the fall to the very last moment of it.

As you start falling off the chair, GPE starts converting into KE. 
KE increases as more GPE is lost through the reduction in height. 
The higher GPE you have at the top, the more KE you have at the bottom as more and more GPE is converted to KE as you approach the ground.

TLDR, here are some differences between KE and GPE:
1. GPE is highest at the top, while KE is lowest at the top.
2. GPE is lowest at the bottom, while KE is highest at the bottom.
3. GPE comes from being at a higher place (often non moving body), while KE is in every moving body.

PS: Energy cannot be created or destroyed. Different energy come into existence as it changes forms from other forms, like how GPE changes into KE as you drop to the ground, and how KE is changed into GPE as you go higher up. The total amount of energy at the top and at the bottom remains the same.
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