This is a list of game development resources I gathered that helped me advance my skills:

• Ming-Lun “Allen” Chou: Gameplay programmer. Contains tutorials about multiple topics such as Game Math, Physics, Programming, etc. This is top-notch content.
• Inigo Quilez: Graphics programmer and co-creator of Shadertoy. An incredible resource regarding SDFs and Fractals (among other topics).
• Kostas Anagnostou: Graphics programmer. In this blog, you can find information about all the dirty, low-level details of graphics programming. One of the best places to look for advanced graphics concepts.
• Panos Karabelas: Graphics programmer. Panos is the creator of Spartan Engine, one of the most complete one-man graphics engine you can find.
• Harry Alisavakis: Technical artist. Here you can find tons of tutorials regarding shaders, tech art, and, in general, how to make stuff look good.
• Freya Holmer: Amazing channel containing tech art and mathematics tutorials. It also contains the best video explanation of Bezier Curves you will ever find.
• Tom Looman: Great place to look for all kinds of Unreal Engine programming tutorials.
• Catlike Coding: Unity programming tutorials, covering a great variety of topics.