Explanations:
I can learn, say, Photoshop, because i can do it at home. I can pay for a course in Drawing, but i cant learn a job that depends on me being hired into that job. So, things like mechanic or carpenter are out.
I can dish out fifty bucks a week for tutoring, but i cant buy myself a five grand machine.
Why is carpenter out? You do need a few things to get started, but not much. You can start with a hand saw, wood glue, and sandpaper. You also need some kind of measuring device, a ruler, tape measure, or triangle square. A hammer and nails would probably be a good idea too. Edit: Oh, and clamps are good. At that point you can build yourself a
miter box.
Other useful hand tools could include a chisel and a sharp knife for whittling, particularly if you want to do intricate surface designs. Then you can start building and selling little furniture projects. You don't even have to finish them - "unfinished furniture" is a thing. Useful power tools at some point would be a hammer-drill, a small hand router, and a circular saw with track. (Build your own sawhorses for use with the circular saw!) But you could probably "build up" a little capital without them.
Note: I've never actually done carpentry - I just watch PBS a lot.