I made a 2D game engine for learning and personal use. I believe making a game engine, even if it’s simple 2D, let’s you appreciate the complexity that is often abstracted away.

Creating a Game Launcher using Qt C++
Here is a guide on creating a simple game launcher using Qt C++. I used Qt Creator with the integrated Qt Designer, and Qt Widgets C++ module. Qt is known for its cross-platform GUI features for desktop apps.

Unreal Engine VR Multiplayer with Photon Cloud
A reference guide for setting up VR multiplayer using Photon Cloud, Voice and Chat – Multiplayer plugin for Unreal Engine by xixgames.

Unreal Engine Multiplayer with Photon Cloud
A reference guide for Photon Cloud, Voice and Chat – Multiplayer plugin by xixgames. You can use this plugin to quickly add multiplayer to simple apps.

Recommended Unity / Unreal Dev YouTube Channels
A list of Unity and Unreal YouTube channels that discuss intermediate-advanced topics often not covered by other more popular channels.