how to make a game engine code example

Example 1: how to make your own game engine

Step 1: Learn Linear Algebra. 
Step 2: Learn C++ (or any language you want) 
Step 3: Develop a Math Engine. 
Step 4: Learn Computer Graphics. 
Step 5: Learn OpenGL and do a lot of projects. 
Step 6: Learn Design Patterns. 
Step 7: Develop a Rendering Engine. 
Step 8: Review Newton's Laws of Motion.
Step 9: Learn Computational Geometry Algorithms
Step 10: Develop a Physics Engine
Step 11: Develop a game, Test & Repeat

Example 2: how to make a game engine

learn, u boyo, LEARN

Example 3: game engine

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Unreal engine
Unity
Godot
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Example 4: best game engine

I reccomend unity. It's easy to learn and has little-to-know boundries. also it's for absolute PROS

Example 5: how to make a snake game

dont ask me, how would I know?