I went to the profile of some users and clicked on the trust system and found that they got green trust and some of them have red trust.
And go to my account and see there is a post a new feedback and trust settings options. I really don't understand these things can someone give me some details please?
Others have sent links wherr you will learn about the trust system feedback, but I want to explain little to you based on your question in OP so that you will have a tip of what you will expect in the links.
Green feedback means the trust is positive and it goes to the left side of the
+ 0 -. You give someone positive trust if they have transacted with you without issues and if you feel they are not likely to scam. The
Red feedback is negative which goes to the right side. You leave negative feedback is someone has scammed or cheated. The last is the neutral tag. You use it when the feedback is neither positive enough nor negative enough.