What skills does shadow boxing develop?

everything! speed, punching technique, footwork. It's very important

It's important for every boxer, especially beginners..

It does nothing if you just stand there and throw punches. You must image your opponent. Must see the punches coming etc.

It helps me

It can really help out your combo's, head movement, speed, and stamina. Great workout for anyone to do.

It's probably the most important type of training in boxing.

Yep it's very important, like others already mentionend. Also it improves your coordination between hands and feet, which is very important if you wanna land punches later on in sparring.

What skills does shadow boxing develop?
it depends on how you do it
it brings footwork
helps your reflexes
helps hone your skills
helps with speed

you should shadow box as if there was someone fighting you
work on your footwork slip punches

look in a mirror and see if you are throwing punches correct
see if you are on balance

threow combinations and if you are off balance or cant come back to your origional stance youa re doing somethign wrong

shadow boxing allows you to see yourself in action without having to hit something or someone hit you
it lets you see what you are doing right or wrong