I am new to game development. I had recently worked with Unity 3D but its not free so I switched over to Unreal Engine. Documentation on Epic Games's website is not in detail and hard to understand for new game developers.
When I was new to Unreal Engine, I looked into the following video playlist. Have a look. It is collection of 208 Videos.
https://www.youtube.com/playlist?list=PLZlv_N0_O1gaCL2XjKluO7N2Pmmw9pvhE