Restrictions are in place for new players to prevent the server from being ruined by players who will never return.
The restrictions are controlled by playtime and playtime only. Once you have played for enough time, you will have no restrictions and every player is exactly the same. There are no ranks
Protection of blocks, chests and mobs is automatic and you do not need to do anything to get your protection. However, blocks are only protected 3 hours after they have been placed, to prevent trapping new players. Mobs are protected if you were the one that bred them.
These protections only protect your blocks, chests and mobs from NEW players, once players have enough playtime, they CAN break your things.
New players can not:
Use Lava
Use TNT
Break players blocks
Kill players mobs or damage their villagers (first person to trade with a villager claims it)
Take players items
There are a few commands: