I don't know anything about making shoes, so right now, I like it a lot. Kind of like going out on a first date, you don't know anything about each other, so you seem like a perfect match. Then you find out she likes mung bean flavored ice cream or synthetic socks.
Bags and shoe making are actually really similar. You use thread and leather. A lot of the machines are the same, this is based off of the fact that I know nothing about shoe making.
The leather is the same, so is the thread.
The main difference is that a shoe is three dimensional and has to fit perfectly or else you'll be real uncomfortable.
There are patterns involved. I recently learned that most bag makers use patterns. So I learned how to make patterns. Do you know what it's like to make a bag without a pattern? I do, because most of my work is custom, so I make a lot of bags without using patterns. I guess you could call them patternless vs. patternful. It works like this: I kind of imagine the dimensions of all the components and scribble some numbers on a piece of paper. They usually turn out ok.
The leather for shoe making is totally different from bag making, but otherwise exactly the same. I could use this leather, about 7oz? for the flaps of my rando bags. I've done it a few times, it usually turns out awesome. Amazingly enough, this leather wasn't even super fancy. It was good, consistent, and well dyed, but amazingly not amazing.
I guess the lesson here is that shoe makers often make bags because bag making is much easier than shoe making. At some point, I'm going to start making shoes. Hopefully starting with someone like this very nice 79 year old gentleman.