This is how google will help you make money online with affiliate marketing
One of the google product thus google alerts. is the best place to start to make money if you're in a tight budget.
No need to invest into paid traffic like facebook ads, google ads etc but still you can make a few bucks for free.
Checkout the video on how you can make $100 bucks for free using google alerts.
Do you want to see my case study how i make $50 in a few minutes of setup paid way.