I have a friend that is the city manager of a town of about 25,000 where his main task is processing requests for building permits. Actually a volunteer-type job, no salary. But he makes a bunch of contacts every day, and his address book is huge. So he is busy all year except the Holidays. To fill in this time he started a Christmas tree lighting service (houses, lawn ornaments, etc.). In this 3-month period he makes enough to keep him going the rest of the year.
These pay-per-click ads appear on your blog. Every time somebody clicks on an ad (which is supposed to be about a subject related to your niche), you make a few cents or more. Small amounts each time, but it adds up. This is extremely hands-off. You just need to get a code from Google, place it on your website - and the ads will automatically appear on your blog. Google will only show ads that are relevant to your blog so it's a good experience for your visitors and maximizes the number of clicks you get, meaning more income.
If you are a creative, digital professional who thrives on forming the layout, visual theme, font set and color palette of a website, freelance web design may be a good path for you. If you have little to no experience in this field, you can learn the basics of web design and master the tools you'll need for success, like Adobe XD, Chrome DevTools and text editor software.
Basically, you pick a profitable niche for your online business, and then you find an affiliate partner who has products available in that niche. Some of the most popular affiliate sites are Clickbank.com, Amazon.com, and CJ Affiliate by Conversant (formerly Commission Junction). Between them, they offer just about any digital information product (like ebooks, audio files, video files) or physical product you can think of. May big name companies and brands, like Wal-Mart, Home Depot, etc. run their affiliate programs through these third-party affiliate sites.
Best of all, unlike a brick-and-mortar business, you don’t need a lot of startup capital. In fact, you can get many internet businesses up and running with no money at all because so many free services facilitate the possibility. For example, you can set up a website or blog for free using WordPress. Or you can leverage a third-party site like Amazon or eBay to sell goods with no inventory costs. You use their selling platform in exchange for giving them a cut of your sales.