The Gameplay Ability System is an incredibly powerful plugin that ships for free with Unreal - I’ve used it with every single project I’ve worked on recently.
If you’ve ever dreamed of making a game like Diablo, Starfield, Cyberpunk or Fallout, you should use this plugin.
I give an overview of the system, how to set it up in your project and get your first ability set up.
https://dev.epicgames.com/community/learning/tutorials/XXv4/unreal-engine-an-introduction-to-the-gameplay-ability-system