A
two-way mirror is a mirrored VDEV composed of
two drives;
A
three-way mirror is a mirrored VDEV composed of
three drives;
And so on...
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Generally, a standard home user won't need a special VDEV, L2ARC, or a SLOG unless you are doing either some specific workloads or really big and performing systems (both cases that require a good understanding of ZFS, TN, and a bunch of other things).
Dedup is even more out of the question.
P.S.: If you want to learn you can find more informations in the resource section of the forum or in my signature.
