I really love leather.  Something about the different types and styles of things, and the different techniques to make it.
What are some of the techs?
The one I'm most familiar with is vegetable-tanned, and then it's oiled to make it waterproof.
I have heard they do that before
You have to make sure oil leather things frequently to keep it supple, plus it makes it last a lot longer.
How to you get leather?
I'm not sure what you mean.  I mean you can buy it anywhere, but if you're talking about how it's manufactured, i can range from small to heavy industrial production of leather.
Can you get leather from things besides cows?
I have a lamb skin jacket.  It's a softer leather, but it's more expensive than cow.