Introduction to the Crop Tool:
What does it mean to CROP?
"In the printing, graphic design and photography industries, cropping refers to removing unwanted areas from a photographic or illustrated image. One of the most basic photo manipulation processes, it is performed in order to remove an unwanted subject or irrelevant detail from a photo, change its aspect ratio, or to improve the overall composition."
Fixed or Free Crop--on the Options Bar
Cropping Tips Video
Let's try it with the Cat Photo below:
Straightening the Horizon:
Straighten "the lean":