One of my friends told me ''sharing affiliate links in this forum is prohibited and might cause me to get negative trust
Correct: It will likely get you banned.
I would like to know whether sharing affiliate links in the signature is also prohibited.
Yes, you are allowed to do that.
Thanks for your answer
I read somewhere that I'm allowed to share my referral link when I'm replying other posts. is it true?
Consider a person has asked where to earn free bitcoins or where to invest? Am I allowed to share my referral links when I'm replying?