Chunk Claiming Commands:

/chunk claim claims the chunk you are in
/chunk unclaim unclaims the chunk you are in (you must own it)
/chunk show shows the chunk you are in (make sure your particles are on)
/chunk alert toggles alerts when a player enters a chunk owned by you (alerts are recommended to be toggled off)
/chunk give [player] transfers ownership of the chunk you are in to the specified player
/chunk access [player] gives a player access to all your claimed chunks

Teleportation Commands:

/tpa sends a teleportation request to the specified player
/tpaccept accepts an incoming teleportation request
/tpdeny denies an incoming teleportation request