first, i will like you to know that this is the wrong mindset to start with, this forum is not an earning site like you called it, your friend must have misinformed you, this is a forum centered on Bitcoin and cryptocurrency discussions, it is a place to learn what you don't know and also teach others what you know, the earning part of this forum is a minority as that isnt the basics of the forum, it is just a side bonus which cannot be depended on.
Maybe your friend is a bounty hunter or signature campaigner, or maybe he or she provides some kind of service on the forum, all this are ways one can earn on the forum which I believe does not require any kind of special skill, as this is absolutely secondary to the actual purpose of the forum.
I hope this helps change the mindset you signed up on the forum with, this is not a earning site, but a discussion forum where peeps can teach and learn about crypto.

I believe all this have been clearly explained to you by other users.