I have a question about this tutorial. At about 17:00 min Blender Guru creates a window and then selects a door of this window and moves that door to the left. I have tried to follow him doing that (you can see the strokes he makes) but I have still questions.
He seems to select a part of this mesh (window) and then simply moves it away. How is it possible that he can just move away part of this mesh (I mean it is connected to the rest of this mesh). And he also seems to do CTRL +L, why is that ? I simply don't understand this select and move away operation.