Take a look at Modular Game Features, a system that lets you inject new content and experiences into your game via a plugin architecture.
Topics
ActorIO Plugin
Plugin Builder
GitHub Plugin Downloader
The Unreal Engine Game Framework: From init main() to BeginPlay
Unreal Engine Persistent Data Compendium
FlowGraph
Make 2D Games the EASY way in Unreal Engine 5 - PaperZD Tutorial
Microsoft Project Acoustics UE5 Marketplace Plugin | Inside Unreal