The goal of The Odin Project is to provide a complete path for students to go from zero programming knowledge to employed as web developers while working with other students and picking up the skills to become self sufficient along the way. https://www.theodinproject.com

Introduction to coding About this tutorial The purpose of this tutorial is to introduce how coding works, with the C++ language here, by creating and explaining, step by step, the code of a small 2D game. In other words, the goal is to provide an overview of programming with the C++ language. If you wish to learn to code or to improve your C++ skills, you will find, at the end of this tutorial, a link to a free and in-depth C++ course. The code of the game and some coding concepts will...

DevDocs

Check out the game engine documentation for Godot.

Documentation for Unreal Engine.

Check out the Unity3D game engine documentation.

GameMake Studio documentation for GameMaker Studio 1.4 to you build your games.

GameMake Studio documentation for GameMaker Studio 2 to you build your games.

Check out w3school for Online Web Tutorials.

MDN Web docs are great for looking for help with your web projects.