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Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.
But don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, consider offering your guests paid add-ons, like Lauren Gheysens', Royal Day Out in London, England—where she gives visitors a local's only tour of the city, complete with bespoke 18th century costumes.
Wow that’s a lot of very different kinds of topics you plan on covering, Rolland! My advice would be to pare it down to just 2-3 closely related topics that you can start to build an audience around… and from there, focus on just a small handful of activities that’ll help you attract some viewers/readers (rather than spending time on a lot of different tactics).
If you hook up with a for-hire car parking service (the type hired out for fancy neighborhood parties) you can make some nice cash tips in just a few hours at night and on the weekend, when parties are held. The key here is to do a great job by showing hustle and being super friendly. This was one of the most enjoyable jobs I had during graduate school. Who doesn’t like to drive nice cars?
Before you really roll up your sleeves and monetize your personal or professional skills, why not right-size your life? Selling your unwanted stuff is a great way to downsize and declutter your life while earning some income on the side. If you’re transitioning to full-time work-at-home status, that income could provide a critical boost to your plans for a proper home office, or allow you to maintain your lifestyle during lean times without resorting to voluntary simplicity.