For first answers why don’t you just look it up in a dictionary to see what a troll is?
For my honest reply to your question.
A troll is a bored person just trying to hock up some conversation with others so he writes crazy things on the topic to get others to reply and wastes their time on nothing cause he’s not really being serious and just trolling around the coffee room. The person needs to get a life and a job so he stops wasting his time doing nothing but trolling