Hi Andy,
I’d recommend you use the Blender Version to follow along and when you wait a bit, the updated (for 4.2) Fundamentals will be released (expected August 13th).
You’ll probably fly through the new Fundamentals of Rigging, because you already know everything and it’ll be easy to adept to the Blender 4.2 workflow.
But if you can’t wait, you can assign Bone Colors here:
