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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