In this Introduction to Blueprint video you will learn what is blueprint in unreal engine. What is level blueprint what is class blueprint and we will create a simple blueprint where when a character enters the room the light becomes on and when exit it turns off. This can be used in games, archviz, level design etc.
https://dev.epicgames.com/community/learning/tutorials/r6Wl/introduction-to-blueprint-in-unreal-engine