We recommend using a square image for your business logo. This tends to work best on mobile devices - It’s not required, just a helpful suggestion.
Your cover image will be automatically cropped to fill the header area.
The size and shape of the header space depends on screen size and device orientation
It’s best to use a landscape image, something abstract, or anything that still looks good if the top or sides are cropped
You can also leave the cover image blank if you prefer a clean, uncluttered look.