I don’t want to go into many details because this is and will continue being a controversial topic, but you need to know that with the move from Lifecycle Services (LCS) to PPAC we’re going from a slot-based model to a capacity-based model.
In LCS we have slots, the minimum 20 licenses include 2 slots, one for a production and one for a sandbox environment. And if you need more sandbox environments, you need to purchase add-ons for another slot.
This changes to a capacity-based model, where instead of slots, we need available capacity (GB) in Dataverse.
Of course, you can (try to) learn more reading the licensing guide. Now, I’ll continue with the development part which is what I’m good at 🙂