Worlds
Piglin has 7 worlds. You can see which world you are in with the command /coords.
spawn: This is the world you go to when you type /spawn. You can not build in this world. You can visit this world with the command /spawn.
world: This is the main build world. This world does not reset. You can visit this world by using the command /rtp.
world_nether: This is the main nether world. This world does not reset. You can visit this world by using the command /warp nether or the command /rtp nether.
world_the_end: This is the main end world. This world does not reset. You can visit this world by using the command /warp end or the command /rtp end.
resworld: This is the resource overworld. This world will sporadically reset. For this reason, claims are disabled in this world. The borders of this world expand by 1 block every time anyone votes. If you are looking for rare overworld loot, search near the borders of this world. You can visit this world with the commands /warp resworld and /rtp resworld.
resnether: This is the resource nether world. This world will sporadically reset. For this reason, claims are disabled in this world. The borders of this world expand by 1 block every time anyone votes. If you are looking for rare nether loot, search near the borders of this world. You can visit this world with the commands /warp resnether and /rtp resnether.
resend: This is the resource end world. This world will sporadically reset. For this reason, claims are disabled in this world. The borders of this world expand by 1 block every time anyone votes. If you are looking for rare end loot, search near the borders of this world. Elytras are also disabled in this world to allow for all players to have a fair chance at obtaining elytras. You can visit this world with the commands /warp resend and /rtp resend.