Good read and it explains very clearly what split-brain is, and how to prevent it in simple enough terms.

I've had to explain many times myself what split-brain is and ways to prevent it. I just get starred at. . .

As for Homelab 3 node scenario, you could choose either 3-way or 2-way replication.
3-Way replication means you have 3 copies of the data across all three hosts. 2-way replication in 3 node cluster means that:
target1 is on Node1 & Node2
target2 is on Node2 & Node3
target3 is on Node3 & Node1

And there is no need to partition the drive. We'll place a container file and mirror them across nodes.