Some gamemodes include but are definetly not limited to: Factions; Skyblock; Prison; KitPvP; Minigames. Please see below for in depth game descriptions!
Factions: Factions is a game of creating a (group) and getting your faction to the very top. You can do so with the money system, where you can sell and buy items!
Skyblock: Skyblock is your own pesonal island! when starting a Skyblock island, you will be given materials and an island! build farms, generators, and basically things to sell on your island with the stuff you are given, and sell/buy things in the shop!
Prison: Prison has nothing to do woth a prison... prison is pretty straightforeward! you mine items in /mine and as you mine more you rank up to better mines to get more money.
Minigames: Minigames include short games that only take a couple minutes! These games are fun when you need a break!