A beginner-friendly tutorial on building a patrolling AI character from scratch in Unreal Engine 5.7 using Blueprints. It covers the core pieces of UE’s AI system (AI Controller, Behavior Tree and Blackboard), creating an AI character, setting up a patrol route actor with an array of editable 3D widget points, building a Behavior Tree with a custom task that picks a random patrol point, adding a NavMesh Bounds Volume, and debugging the Behavior Tree at runtime. It ends with fixes for the most common beginner issues and ideas for extending the system with AI Perception, wait nodes and sequential patrolling.
https://dev.epicgames.com/community/learning/tutorials/jODP5/unreal-engine-how-to-create-your-first-patrolling-ai