You can get a free online Photoshop course, which covers the following
Module 1: Introduction to Photoshop
Introduction to the Course
Where to Download Photoshop
Review of the User Interface
Module 2: Photoshop Basics
Creating a New Document
Navigating Around a Document
Working with Brushes
Brush Options and Settings
Paint Bucket and Marquee Tools
Working with Gradients
Using the Eye Dropper Tool
Using the Blur Brush
Working with Dodge and Burn
Working with the Clone Tool
Understanding Photoshop Layers
Working with Text
Applying Effects to Layers
Working with Shapes
Combining Different Documents
Brightness and Contrast
Image Size vs. Canvas Size
Read more and get it free from here, this will costs you $49 other wise
[Via TipRadar]