The CS6 version of Photoshop introduced several new features, one of which was modifications to the Crop tool. This is one of the many functions we look at in our Adobe Photoshop training courses.
CS6 also introduced the capacity to  control the look of the User Interface. You can make it darker or lighter, etc, via the Edit > Preferences (Mac:Photoshop > Preferences) dialog box, the shortcut for which is Control + K (Mac:Command + K).
Another feature introduced in CS6 was the new and improved Crop tool. It’s more like Adobe Lightroom’s cropping in that it’s non-destructive (unless you want it to be). For example, open an image like the one illustrated here. This is a festival dance at the Jokhang Temple in Lhasa, Tibet.
Choose the Crop tool and note the tools icon which appears – here you can return to the Crop tool’s classic mode if you prefer. Turn off the Delete Crop Pixels button on the top Control panel, in which case it will not delete the data. Then pull the handles to crop the image. When you are happy with the result click the tick icon.
Then do some of the standard operations like Levels or Curves adjustments, etc. Then if you later decide that you want to bring back some of the original image simply return to the Crop tool and pull out the handles. Note on the top left of the Control panel the setting for Constrained to original aspect ratio and other presets.
Many more tips and techniques can be found at the Adobe website. And see many examples of our clients’ work on our Facebook page.
Other related Photoshop Blog Posts:

• Photoshop interface
  
• Photoshop for fashion
• Photoshop deep etching
• Photoshop animated gif
• Photoshop actions