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From the toolbar, select the Crop Tool 
. Crop borders display on the edges of the image.
Draw a new cropping area or drag the corner and edge handles to specify the crop boundaries in your image.
(Optional) Specify the Crop options using the Control bar.
A. Active tool B. Size and proportions C. Rotate crop box D. Straighten image E. View F. Crop options G. Delete Cropped Pixels
Size and proportions
Choose a ratio or size for the crop box. You can also choose a preset, enter your own, or even define your own preset values for later use.
View
Choose a view to display overlay guides while cropping. Guides such as Rule of Thirds, Grid, and Golden Ratio are available. To cycle through all the options, press O.
Crop Options
Click the Settings menu to specify additional crop options.
Use Classic mode
Enable this option if you want to use the Crop tool like it was in previous versions of Photoshop. See Adjusting crop, rotation, and canvas for information on using the Crop tool in classic mode.
Auto-center preview
Enable this option to place the preview in the center of the canvas.
Show Cropped Area
Enable this option to display the area that is cropped. If this option is disabled, only the final area is previewed.
Enable crop shield
Use the crop shield to overlay the cropped areas with a tint. You can specify a color and opacity. If you Enable Auto Adjust Opacity, the opacity is reduces when you edit the crop boundaries.
Delete cropped pixels
Disable this option to apply a non-destructive crop and retain pixels outside the crop boundaries. Non-destructive cropping does not remove any pixels. You can later click the image to see areas outside current crop borders.
Enable this option to delete any pixels that are outside the crop area. These pixels are lost and are not available for future adjustments.
Right-click the Crop box and access common crop options from the context menu.
Press Enter (Windows) or Return (Mac OS) to crop the photo.
