Hey Mrugank,
There are a ton of ways to make a few extra hundred dollars with affiliate marketing.
If you don't know what to promote I suggest that you go over to Clickbank and choose a High Grav. product (over 100).
Then make sure the payout is over $30 and there is a higher Referral rate.
This will tell you that people are making money with this affiliate product.
From there you can create a BONUS to go along with it, or just direct link using Google Ads.
What is your level of experience so far?
What have you tried?
What has worked and what hasn't?
Best,
Bryan Dulaney