2. What is Prototypal Inheritance? How does it work?

It is hard to explain something clearly. I'd suggest you take a top-down approach for this kind of abstract concept.

for example.

1. generally what it is
2. what does it consist of , how does it work
3. what can we gain by using it
4. what we need to pay attention to .
5. ....

If you are not familiar with Prototype, I recommend you first thoroughly read this article from JavaScript.info.

Good Luck!