in unreal development 50 hours is nothing compared to time it takes to figure everything out 
Tutorials or not you’ll be spending a lot of time figuring out unreal specific things or general information when you need to make things. Best thing is to get started on something small you enjoy making and throw away later to make something better. When you run into a problem google the stuff and if you really can’t figure it out post a question on the forums. Many tutorials go through X minutes of non specific “how to do this and that” which you don’t need if you are not actually working on something specific. The engine is so big that a beginner tutorial to see basic functionality of it all would easily take 50 hours. 1. start doing something. 2. run into a problem. 3. search how to fix it.
There are some useful resources though. I posted some links in these posts:
UE Cpp documentation is very limited - #8 by Roy_Wierer.Seda145
Any good documentation of the structure, architecture, and internals of Unreal Engine?