A claim protects your area: inside it nobody can build, break or open chests without your permission.
Golden shovel: right-click two opposite corners and the claim is done. At least 5 blocks per side and 100 in area. With the shovel you can also drag the edges to make it bigger.
Stick: right-click a block to see whose claim it is.
The first chest you place creates a small claim around it by itself.
You start with 1,000 claim blocks and earn 100 for every hour you play.
Command
What it does
/trust <name>
Can build and open everything.
/containertrust <name>
Only chests and animals.
/accesstrust <name>
Only doors, buttons and beds.
/permissiontrust <name>
Can give permissions to others.
/untrust <name> /trustlist
Remove permissions; see who has them.
/claimslist
Your claims and the blocks you have left.
/abandonclaim
Delete the claim you're standing in and get all its blocks back.
/subdivideclaims
Split the claim into areas with different permissions.
/extendclaim <blocks>
Extend the claim in the direction you're looking.
/trapped
If you're stuck in someone else's claim, it gets you out.
Claims work in the Overworld, the Nether and the End, not at spawn.
To use /sethome in someone else's claim you need at least their /accesstrust.
Anyone you let in can rob you: staff won't step in.
If you don't log in for 60 days, your claim can expire.
Rank commands
Command
What it does
/fly
Builder and Pro: fly. It doesn't work in the PvP arena or for 15 seconds after a hit.
/gamemode creative /gamemode survival
Master Builder and Master Pro: creative mode too.
Builder and Pro also get up to 10 homes. All the ranks are on the Ranks and tags page.