This is a wide topic. In this section, you can find YouTubers who teach about game development programs (Unity, Unreal Engine, etc.), core concepts in different programming languages (JavaScript, HTML5, Java) and art/design creation, 3D modelling and much more.
ScriptersWar
Content about: JavaScript, HTML5
Featured playlists: How to Make HTML5 Games: JavaScript Tutorial for Beginners JS Guide, a lot more videos.
Brackeys
Content about: Unity, C#, Game design
Featured playlists: How to make a 2D Platformer - Unity Course, Making a Multiplayer FPS in Unity, How to program in C# - Beginner Course, Unity 2D Tutorials.
Jonas Tyroller
Content about: GameMaker Studio, Tips and planning playlists
Featured playlists: Will You Snail? - Full Development., Game Dev Tips, How To Get Started With Game Development..
RealTutsGML
Content about: Java, GameMaker Studio
Featured playlists: Java Basic Programming, Cool Game Maker Tutorials, Beginner Java Game Development, Java Platform Game Programming.
Mark Rise
Content about: Game design, Animation
Featured playlists: Geometric design playlists, Video Game Character Animation Course, After Effects Animation Tutorials.
Chris Courses
Content about: HTML5 Canvas, JavaScript
Featured playlists: HTML5 Canvas Tutorials for Beginners | Become a Canvas Pro, other JavaScript-related videos.
Zenva
Content about: Unity, Unreal Engine, Godot
Featured playlists: Master Unity Game Development, Unreal Game Development Mini-Degree, Godot Game Development Mini-Degree, a very lot more playlists about game development and design!.
Mix and Jam
Content about: Unity
Featured playlists: Mix and Jam Recreations, Game Jams, RE Mix and Jam.
Sebastian Lague
Content about: Unity, C#, Game design
Featured playlists: Introduction to Game Development (Unity and C#), Procedural Planet Generation, Coding Adventures.
DaFluffyPotato
Content about: Pygame
Featured playlists: Pygame Tutorial Series (beginner), Pygame Tutorial Series (amateur), Pygame Tutorial Series (advanced), more Pygame videos!.
ChiliTomatoNoodle
Content about: C++, DirextX, 3D
Featured Playlists: Beginner C++ Game Programming, Intermediate C++ Game Programming, Advanced C++ Game Programming, 3D Programming Fundamentals, C++ 3D DirextX Programming.
GDQuest
Content about: GODOT
Featured playlists: Godot 3 tutorials, 3d Maze Game in Godot, Make Your First 2D Game with Godot, Godot - Beginner Game Creation Tutorials.
HeartBeast
Content about: GODOT, 2D, GameMaker
Featured playlists: Godot Engine Tutorials, Resource Based Inventory Tutorial in Godot, 2D Hack-n-Slash Course (Complete Course), GameMaker Platform Tutorials.