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When cropping images it is important not to lose valuable information. It is best to source images that are the correct shape if possible.
Here you can see an illustration of a giraffe that is best suited to appearing in portrait.
If we crop this illustration to make it landscape we lose the head and feet.
If we add extra space to the left and right of the illustration the background is not continued.
Here you can see an illustration of an elephant that is best suited to appearing in landscape.
If we crop this illustration to make it portrait we lose the trunk and the hindquarters.
If we add extra space to the top and bottom of the illustration the background is not continued.