I think there should be a special policy in the discussion do not be too free people do post that passes the discussion so that the discussion can be organized and the discussion so do not deviate to other discussion.
if there is a misconduct might have better delete his post only

You can simply press the "report to moderator" option that can be seen on the right side of every post. And if you find those post that isn't right on the discussion, sort of off topic or disrespectful then hit that button and wait for the action of the moderator. Later on, those post will surely be deleted if they assessed that those posts are insubstantial or off topic.

I hope the forums are moderated a little bit a lot more cautiously from now onwards. Spammers and individuals promoting some kind of advertisements ought to be banned absolutely.

Who are the people that will be monitoring and "policing" the forum(s)?

I am a newbie here. Please give me a guide to do assigned tasks.

What is considered as referral spam?

Can i start a thread that objectively discusses the benefits of a coin and post a link at the end?
How about a poster about the pros and cons etc with my referral in it?

No. Ref links are rarely allowed. You're explicitly just creating the thread to post the link.

There already is one. If a post is edited the time/date becomes dotted and if you hover over it it tells you when it was last edited.

the most important thing about this issue is gonna be the policy. That ugly word comes a long way according to population control.