Not all people responded but I will still proceed with my second question.
In which case we should use "Report To Moderator" or report post.
It's pretty much standard thing on any forum, if you see someone breaking any rules you should report them to mods so they can warn, ban or just plainly do something about it so it doesn't happen again. Every forum has rules and you can find the rules for this one in the following thread.
https://bitcointalk.org/index.php?topic=703657.0Also every bitcointalk sub-forum has it's stickies with some additional rules that should be followed. Like this one from Bitcoin Discussion.
https://bitcointalk.org/index.php?topic=20333.0
Challenge Ques 2. In which case we should use "Report To Moderator" or report post.
Quoted the response.
"Report to moderator enables you to report abusive or wrongly-placed posts to the forum staff."
https://bitcointalk.org/index.php?action=help I realized that this button is pressed in case of spam, or the message is posted in the wrong place, or having insults in the message.