If someone could post here its own signals, how do you know if the signal is good or not?
That'd depend on trader's reputation within this thread. Anyone can come and post signals here, and you can judge that particular trader's skills/reputation by looking at the previous signals provided by that trader.
You are Hero member here, you have more trust than others members

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Well, I must hereby tell you that having a good rank in the forum doesn't necessarily make you a good trader. It's not like that I received the Hero rank by making accurate trades!

Yeah, but I wanted to say, that you are trusted person and you do not want to scam people here. For example post fake signals. (Signals from pump and dump groups)