Learning is a lifelong endeavor
Especially if you use software. Much as I love it, Photoshop is a great tool with a steep learning curve. It is one of the parts of the Adobe Creative Suite.
I use the Create Suite tools daily for developing brand elements.
Adobe updates applications with complete revisions about every 18 months. With each new version of the software, there are more cool and useful ways to get ideas translated into visual designs.
Scott Kelby is the author of The Adobe Photoshop CS6 Book for Digital Photographers. His writing style is friendly, instructive and fun. He is a great guide for getting the most out of Adobe Photoshop CS6. Check it out.