You can sell product from your own website store, via community sites and classifieds (like Craigslist) and of course eBay and collectively make good money. The challenge, like with any business, is defining what is your competitive advantage and can you come up with a model that meets your needs. For me selling physical product was a great proving ground, but I eventually learned that profiting from information was a preferable model if I wanted to meet my aforementioned business goals.
To advertise my tutoring service I marketed using posters offline and eventually set up a website and marketed on classified sites as well. I charged $15 an hour and eventually had a few Korean clients. This idea eventually ballooned into a full on English school with a real world premises that I managed for eight months before closing down. It turned out to be an experiment that taught me I much preferred online business to bricks and mortar.
Research individual companies in your desired niche: If possible, it’s always better to become an affiliate directly with a company (if they have an internal affiliate program), as no one else will be dipping into your commission rate. This is the preferred route for most of the prominent affiliate marketers, including Pat Flynn. Unfortunately, it’s also the most work, as you’ll have to do the research yourself to see who offers programs (they’re usually listed in the website footer).
Using a food delivery service can’t necessarily earn you money, but it can help you save you money if you constantly find yourself throwing out half the food you buy. Food delivery services send a box of food every week with new, sometimes unique vegetables, meat, fruit, and so on. If you don’t have time to shop and want simple meal-prep that leads to a good meal, a food subscription service may be perfect for you.