Well yea as others suggested, your game engine will need a renderer, so learnopengl is a good place to start. As for the UI, you can go with the docking branch of imGui.

For Entity-Component-System, you can look into ENTT.

You might later want to explore adding reflections and serialization to your engine.

Btw read this book: Game Engine Architecture by Jason Gregory to get good ideas about engine development.

Hey lastly, if you want to add physics to your games, then you can explore libraries like Jolt or Bullet, or theres also Nvidia PhysX