Step 1 :
Select the Crop Tool
Photoshop automatically places a crop box and handles around your image. You’ll find a crop handle in each of the four corners as well as at the top, bottom, left and right.
We can click on any of the handles and, with the mouse button held down, drag them around to resize and reshape the crop box. Photoshop darkens the area outside the crop box so it’s easier for us to see which part of the image we’re keeping.
You can easily move your crop box area up down left right simply click on box.