Fiverr is one of the biggest providers in the gig economy on the web and you can sell a wide variety of services and products through this medium. Do the research and find out what you can offer. However, keep in mind that like any other money-making task, it takes time to succeed here. And stellar reviews will help you generate more and more income over time.
That way, if you decide to write a review to promote it or send the affiliate link for the product's sales page to your email list, etc., you will have first-hand knowledge of how it works. This will help you to decide it the product has real value pertaining to your niche. I, personally, won't sell anything I haven't tried myself to be sure they work as advertised. Selling just to make money with no real value is a sure way to lose customers and ultimately destroy your business. Bad reputations are hard to get rid of once you get one, especially when there's money involved. With that being said, I hope you all have a great holiday season.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.