I have to admit, I use this one all the time but I had no idea until recently how it works. How can a company exist that allows users to host conference calls for free? It's actually quite brilliant: under a 1996 law, small rural telephone companies are allowed to charge larger phone companies a per-minute fee when those larger companies' customers call into the smaller ones' areas.
Blogging can be a great side hustle. Though the income may not be steady and it can take awhile to get rolling, there are a few steps you can take to ensure success. I would recommend that before you start thinking about money, you start thinking about the topics you are truly passionate about. What can you talk about and learn about for days? That’s exactly what you’ll be doing for years to come, after all. Get some more tips on starting a blog here: How to Start a Blog and Make Money in 7 Steps
Landscape. Look for brush-clearing, mowing, or woodcutting jobs, some of which may land you regular customers. This can save you money at the same time: if you are hired to pick up pine needles, use them to mulch your roses, which will appreciate their acidity and smothering effect on weeds; if you are hired to cut and clear a fallen tree, use it to heat your house that winter.
If you have a good idea for an app, and the skills to create it, then producing your own premium app can be profitable. However, with so many free apps available, it may be hard to convince people to pay. If you want to go down the premium app route, consider having a basic free version to encourage people to download the app in the first place. You can then provide the option of upgrading to a premium plan once users realize how useful the app is.