best thing to do is join a forum which specialises in photoshop. But if your looking to get into 'graphic' design you want to learn illustrator. Great designer who uses it for web stuff as well is

HERE

Illustrator is overlooked alot by the online community but if someone wants you to create a logo for their business, it's usually easier to create EPS as you can print big with it or keep it small for the web, resolution isn't an issue!