I understand how to draw a cube on the ground (ie lines parallel to the ground) with 3 point perspective, but how do I go about drawing a cube that's rotated to where its lines aren't parallel with it? Like say it's balanced on one corner, where I go about placing the vanishing points? Image related.

As a second question, do I just guess a cube in perspective is a cube is even using vibes or is there a more precise way to do it?