The meaning of a corner can depend on the type of corner and its context:
Turning a corner when you're walking or traveling can represent a change or the start of a new phase.
Not being able to see what's around a corner can represent looking towards the future, feeling like you don't know what lies ahead, or the idea that something in your life is hidden from you or unaccessible.
Someone hiding around a corner can mean you feel they have hidden motives or are withholding information in real life.
Being stuck in a corner can mean you're feeling stuck in a rut or powerless somehow in your life.
Feeling cornered by a person or animal can mean you feel pressured or even attacked in your life somehow.
Being sent to a corner as punishment can represent the idea of punishment, rejection, or isolation by others in your life somehow.