Background Removal 
In Photo editing a fair amount of what people do on a daily basis is removing the background of a picture or image. This can be accomplished many ways, but this lesson discusses only 4. To accomplish this it is recommended you read the Basics Tutorial first.
Easy Methods 
2 of the easiest ways to remove a background are using "wizard" tools and using the lasso tool.
Wizard Tools 
Wizard tools are very useful if you want to remove the background of something with a solid background. Lets say we want to remove the blue background of the following image:
First, get out the magic wand tool. It can be found next to the lasso tool and below the move tool. Then look at the background. If it is 100% one color, set the Tolerance to 0 (If you don't know what that means, please refer to the basics tutorial) Otherwise, set it slightly higher (use this method only on solid or mostly solid backgrounds)