You can either build a really tall structure to symbolize where it is, make a map, or if you built your home near your spawn point, make a compass and follow it until you find your home/spawn point.
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There are no rabbits in vanilla Minecraft.
You cannot teleport home in vanilla, no cheats Minecraft. However, in many servers there is a /sethome command which allows you to set a home and teleport to it using /home.
beacons are used in minecraft for getting some potions on you and knowing where your home is on single player
You cant find a giant mob in vannilla minecraft but you can sumon him using a command or a spawner.
Minecraft seeds can be found on the Minecraft forum. See the related link below.