Terminology
Here are some basic terminology you need to know:
Local machine/system/filesystem/etc: The machine/system/filesystem/etc that is running the interface.
Host machine/system/filesystem/etc: The machine/system/filesystem/etc that will run the generated payload.
Target machine/system/filesystem/etc: The machine/system/filesystem/etc that the payload will target when run, if any.
Rootfs (root file system): A filesystem that includes all the components of an OS.