ClickBank is one of the largest digital sales platforms on the internet with over 300,000 products and 150,000 affiliate marketers. It's also one of the best places to list and even create your own product because you have so many affiliates waiting to promote your product. If you do not have a ClickBank account then simply visit ClickBank(.)com and open a free account as an affiliate, not a vendor just yet because you need to familiarize yourself with ClickBank first.
Inside the marketplace when you want to select a product to promote you can even check on the percentage commission offered which can be as high as 85%. You will notice that there is a search that will indicate "Gravity" and every product's gravity is also included on the marketplace drop down search page. Now a product with a gravity above 100 is an exceptionally good product to promote because it is high in demand. But there's a downside to that coin where the competition is equally fierce and you will face a lot of competition when driving traffic.
A high gravity means the product sells good and a lot of copies have been sold. A Low Gravity, below 100 means less competition in actually promoting the product, and normally offers a much better commission percentage. Promoting high gravity products will require quite some expertise.
There is only one way to truly be able to offer your audience a solution to a problem that actually works, and that is to personally purchase the product you are interested in promoting and testing it properly. Even contact the particular product support after purchasing when you get stuck because the only way you will be able to verify authenticity is to set up and test the product and system to its full potential.
That is why successful affiliate marketers are constantly testing different systems, programs, methods and tactics. It is what enables them to create useful and interesting content that converts to sales.