

The best documentation will always be the plugin source code. GASShooter is a sister Sample Project demonstrating advanced techniques with GAS for a multiplayer FPS/TPS.
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There are branches of this documentation for older versions of Unreal Engine, but they are no longer supported and are liable to have bugs or out of date information. The Sample Project and documentation are current with Unreal Engine 4.27. There is a lot of 'tribal knowledge' of GAS among users in the community and I aim to share all of mine here. The goal of this documentation is to explain the major concepts and classes in GAS and provide some additional commentary based on my experience with it. I make no guarantee for the accuracy of this information. This is not official documentation and neither this project nor myself are affiliated with Epic Games.
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My understanding of Unreal Engine 4's GameplayAbilitySystem plugin (GAS) with a simple multiplayer sample project.
