Warps are preset areas that you can teleport to using the /warp command. To use a warp you simply type in /warp warpname. Warps are case sensitive and should not have spaces in them. This means that /warp my_house is not the same as /warp My_House or /warp MYHOUSE.
To view the warps that you have set, use the command /warp assets
As ships begin to travel around the worlds, there will be warps listed in the hold of each ship that point to previous spawn points for that world.
For more information see how to set a warp and how to delete a warp and how to list warps.