How to Track affiliate link clicks in Google Analytics?

I have earlier covered some nice beginner-friendly articles on affiliate marketing and how to get started with it. The first step to affiliate marketing is to find a suitable affiliate program and to join them. But, what happens next?

After you join an affiliate program, you will receive an email from the respective Affiliate Manager with an affiliate link. All they request you to do is to share the affiliate link. And whenever any sale takes place through this affiliate link, you will get a commission.

Wait!

But, who will be purchasing through your affiliate link? How are you ...