Cropping in post refers to the removal of the outer parts of an image to improve framing, accentuate subject matter or change aspect ratio. Most of my images here on BLOG+, in my guides and work for my clients are intentionally displayed as cropped versions of an original shot.
Composition is a key element in taking good pictures. There are several rules here that you should know, such as the “rule of thirds” (golden ratio), visual pathway, using lines, and the point of view. It is important that you know these rules of guidelines. However, sometimes it is good to break the rules and try different creative ideas.