Less is more! The basic mentality for most people is “fill the space”, which leads to things looking messy and cluttered. Allow images and text to breathe. White space in your design will draw the eye to more important components. If your layout is unorganized, the reader won’t know what to focus on and you run the risk of losing your main message.
Essential as it is to leave space amongst design elements, it is also important to stay clear of page edges. Give yourself at least a quarter inch border.