Woodworking. Depending on if you're in a house or an apartment (because fire risk is easier to manage if you're not in an apartment), metalworking.

My brother took up hypnotherapy a few years back.

My mum was a part-time gardener when I was a teen.

Electrician, plumbing, carpentry, HVAC. I learned how to weld (stick "smaw", mig, tig) for <$1000 at my local community college at the time (circa 2008-2009 GFC), and was offered a job (which I luckily did not need to take) after completing the required courses.

I was an electrician by trade before doing SWE and started to do electronic and micro electronic repair in the last two years. It's well suited to do at home but needs a bit of an initial investment ~$1000.