Check out this cool Photoshop DIY where the author shows you how to make lightning and super nova effects.
Apart from the lightning effects, this DIY would be great for playing around with different features of Photoshop.
in this tutorial i show you how to make a lightning effect in adobe photoshop and also a cool supernova effect. i ask that you please watch in fullscreen
also if you have any questions about this please messege me and ill get back to you