How to create angles?

Is keeping your left foot on the outside of a Southpaw's Right foot an example of using Angles? This is one part of Boxing I'm a bit lost with, sounds very complicated lol.

 

i find a good way to create angles is when your opponent is coming toward you take a 2/3 short steps to your right den quickly move to your left and throw the left hook,, make sure its a quick step tho, and do the same while moving to your left and switch to the right and fire the right hand, it might not be what your looking for but i find it a helpful way of wrongfooting opponents.