Live Unwrap

When UV unwrapping, you're adding Edge Marks without seeing the result until you unwrap, in a way working blindly. Live Unwrap and Sync allow you to unwrap things while getting a live preview of the UV unwrapping in the 3D viewport. This allows for faster and better UV unwrapping.

I actually learned this from Zach Reinhardt's Blender Launch Pad course, which has a lot of great tips about UV unwrapping and texturing. You can pick it up here. Note that this is an affiliate link, so if you buy Zach's course you're also supporting Blender Secrets (at no extra cost to you).

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