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does the BUNKY follow a path or uses navmesh?

Navmesh is used in order for AI to walk around the map. But yes, he does use a set path. In his blueprint, he selects one of four paths to take when he spawns to make it a bit unpredictable.

Did you follow a tutorial to make this system?If yes then can you give link of the tutorial?

Technically, no. But I did follow some tutorials to learn how some things work, like how the "Spawn AI From Class" node works. but they were multiple ones and I learned certain things from posting discussions about how this works or how to do this to make this happen sort of thing. What I recommend you do, is just work on your games, and once you encounter a problem, look up a video or post a discussion on the unreal engine forums.

Thanks for suggestion