Dive into a comprehensive 3-hour video tutorial exploring the Gameplay Ability System (GAS) in Unreal Engine. Learn how to set up Graystone from Paragon with gameplay abilities in the Third-Person template. Explore GAS theory, gameplay tags, ability system structure, attribute sets, datatables, gameplay effects, melee damage execution, gameplay cues, root motion, multiplayer considerations, and knockbacks. Discover techniques for creating a melee system, implementing new stats from Blueprints, working with attribute metadata, and integrating GAS with AI and behavior trees. Gain insights on best practices, future roadmaps, and transitioning from Blueprints to C++.