Make 2 square holes in a cube Good morning, 
I'm trying to make two square holes in a cube.
I managed to make the first one:


But when it's time to do the second one, the software can't take the sides of the cube anymore since the cube has been transformed, I can't select the top side but only certain side of the lines, so if I try it gives me something like that:



May I know how to make two holes? Thanks.
What steps exactly are you taking for this process? Could I suggest using The Boolean modifier? If you don't want to use that you could always use the knife tool or CTRL+R to create edge loops.