The simplest zero-capital hustle is not selling something or learning a skill; it is renting out what you already own. A spare room, a rarely used camera, power tools, a parking space, or even a car can generate income from other people's short-term needs, with no purchase required and no audience to build.

Rental income is attractive because it is semi-passive: the asset does the work once the listing is live. But it carries real responsibilities, including damage, insurance and local rules, so the difference between a good rental hustle and a headache is preparation.