The number one mistake that a lot of affiliates make is looking for affiliate products to promote, either because they think that it will earn them bigger commissions or it what they think potential customers might want.
The fact is, nobody goes online to casually hand over money to strangers just for the sake of it.
Instead, people surf the Internet looking for solutions to problems. That is why they decide to buy products, because they believe that it will solve the problem that they have.
The best decision you can make is to find the products that provide solutions to specific problems. When you present these products to people as a solution to their problems they will snap your hand off to buy them.