Whether you are looking to edit an image to fit the size you require, or change the composition and focus point of it, cropping is an important part of the process.
Although it's a simple technique, there are some rules you'll need to follow to ensure you get the best out of your pictures and avoid your work looking amateurish.
BBC Academy trainer Maria Esperanza Sanchez posted this informative article to help you crop visually attractive pictures that display well on computer screens and mobile devices.
The piece also includes a useful video by picture editor Callum Robertson, in which the essential 'rule of thirds' is explained and demonstrated.
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