What hobbies can I grind for finance?

Obviously, you need to have personality for finance. You also need something to talk about interviews, but I have no hobbies and need to develop some.

Here are the preferred criteria for hobbies. I know most hobbies won't satisfy all the criteria, but if they satisfy some of them they'll still be great.

Criteria:
1. Relatable and easy to talk about in interviews

1. Good learning curve (can be learnt within a semester of grinding, maybe even a week of intense focus)

2. Something that can be done with very little cost and easily accessible materials (I'm poor)

3. Can be shown off in things like talent shows

4. Is unique and interesting