Common commands

/plot auto
Claim a new plot in Creative.

/plot visit [name]
Go to a plot owned by [name].

//wand
Get the World Edit wand tool. Click here for a World Edit tutorial.

/channel
Change your active chat channel. Use tab-complete for more details.

/scoreboard (disable|name)
Change the scoreboard type, or disable it with "disable". Use tab-complete for available scoreboards.

Social commands

/ignore (player)
Ignore players to stop receiving chat messages from them.
Use a UUID to ignore offline players, this can be found with the /seen command.

/seen (player)
Check the online status of any player and see their UUID.

/mail
Check your mailbox, or send mail to other players. Use tab-complete for more help.

/msg (player)
Send a private message to another online player.