I am new to UE4 and just watched …Blueprints - 2 - Turning On a Light with Level but then open level starter map the content is different from video … How can I find the original content so that I can lean the UE4
Did you check the box in the left corner that says “include starter content”, when you created your new project?
With any template you open/create, so long as you included the starter content with it if you do the following you will get the map from the video.
File > Open Level > StarterMap
This will bring up the one from the video.