The worlds
Spawn, the main world and the resource world.
/travel opens a menu with all three. Each one has its own job, so the place everyone lives stays beautiful.
Spawn
Shops, notice boards, the crates and the way in. Nobody can build or fight here, so it looks the same every time you come back.
/spawn or /hub
The main world
Where you live. Claim land, build, stay. The terrain is generated with Terralith, so expect bigger mountains and stranger biomes than plain survival.
/rtp (or /wild) drops you somewhere random and unclaimed, so you aren’t fighting over the ground nearest spawn. The Nether and the End are reached the normal way, through portals.
The resource world
Somewhere to strip-mine without ruining the view where everyone lives. Dig, chop and quarry as much as you like, then carry it home. It is smaller than the main world on purpose, so you will run into people.
/resource takes you to the middle of it. To come back, use /spawn or /home.