Ray Wenderlich - Unreal Engine 4 Tutorials
If you're wanting to learn how to use Unreal Engine 4, I've written a bunch of tutorials over at raywenderlich.com.
These tutorials begin with a 10-part series for beginners. This series guides you through installing the engine and covers many systems such as materials, Blueprints, animation etc. There are even two tutorials that teach you how to make a basic endless 'runner' and a first-person shooter.
I have also written 8 tutorials covering various graphics/shaders techniques. Here are a few I recommend:
Note: These tutorials were written in 2017/2018 so some information may be outdated. However, the majority of the concepts are still applicable today.