Alex Forsythe provides many well-put-together videos describing complex topics.
Topics
Working with Data in Unreal Engine; Data tables, Data Assets, UPROPERTY specifiers and more!
Rewinding a networked game
Implementing Instant Replays (Killcam)
Begin Play - Gameplay Framework Overview
Industrial-grade shader techniques to build efficient and stylized grass
The Unreal Engine Game Framework: From init main() to BeginPlay
Unreal Engine Network Compendium
UMG Layout Techniques for Unreal Engine
