Teleportation:

/spawn - Teleports you to the spawn area
/rtp - Allows you to teleport to a random location, with a cooldown timer
/sethome homename - Lets you set a maximum of 3 homes with the given name
/home homename - Takes you to the specified home location
/tpa - Sends a teleport request to another player
/tpaccept - Accepts an incoming teleport request

Misc:

/trade - Sends a trade request to another player
/bottle - Bottles your experience points (XP), e.g., /bottle all to bottle all XP

Land Claim:

/abandonclaim - Deletes the claim where you're standing
/abandonallclaims - Deletes all your claims
/trust playername - Adds a player to your claim with full permissions
/untrust playername - Removes a player from your claim
/containertrust playername - Allows a player to access containers and furniture, e.g., crafting tables, furnaces, chests, and beds
/accesstrust playername - Allows a player to interact with doors, levers, and buttons but not containers
/trapped - Teleports you out of someone's claim if you're trapped inside
/SubdivideClaims - Switches your shovel to subdivision mode to split your claims
/BasicClaims - Puts your shovel back to basic claims mode

Here is a short video to help: https://youtu.be/VDsjXB-BaE0
and another video if you want to make your own town:  https://youtu.be/I3FLCFam5LI
You will spawn with a Golden Shovel to claim land.