You earn commission on anybody’s purchase, except yours, if they use your referral link within 24 hours. One tip here is that you can trade referral links with family members and friends and use their link to make your own purchases and ask them to do the same so there can be sharing of the spoils. This might not be the major way to make money in the affiliate program Amazon runs, but it can help your commission structure.
It doesn’t pay much, but if you’re a healthy person and want to make a bit of extra money online, the AchieveMint app will reward you for doing things like walking, tracking your food, or taking health surveys. AchieveMint works by connecting to fitness apps you might already be using like Fitbit, RunKeeper, Healthkit, and MyFitnessPal and then giving you points for certain actions. For every 10,000 points, you earn $10 with no limit on your earnings.