I want to create a very small grahpics/game engine for my upcoming bachelor exam and I am currently collection information. A few days ago I discovered QT and it is really amazing and I will definitely use it to create an editor.
I know that there is GLFW / SDL but I am not sure what advantages/disadvantages I would get by using QT instead pf GLFW / SDL for a game.

I would use QT for window/input management and possibly for an ingame GUI.