Monarchy is ruled by one person only. It can be ruled be a king, queen, emperor or empress. The ruler decides all the law and rules. the role gets passed down by family blood line. I don't think this is a good governance because the citizens have no power.
In anarchy the citizens have no ruler. They have freedom to do what they want. An means without and archy means ruler.
Dictatorship has a leader. The leader has complete power like in monarchy. the leader gets in to the position by taking over the country.
In democracy the citizens have the right to vote on the leader. Usually some people can’t vote like in the U.S.A you can’t vote if you are to young. Demo means common people and cracy means rule. In democracy citizens have more power than in monarchy or dictatorship.