Keep elements as Smart Objects whenever possible, especially if you are resizing them, to maintain resolution.
A "pack" or "kit" file like GODPACKV2.psd typically functions as a comprehensive template designed for efficiency, often containing dozens or hundreds of organized layers.
These packs are structured to allow you to edit colors, effects, and elements without destroying the original imagery.
I can then provide a step-by-step guide on how to best use the file.
If the file is complex, spend a few minutes renaming layers to suit your workflow.