This document discusses common examples of bad design and provides tips to avoid them. It touches on principles like clarity, deference, depth, ambiguous alerts, out-of-place terminology, excessive branding, uninformative back buttons, and confusing animations. Specific tips include testing in grayscale, ensuring sufficient color contrast, using legible font sizes and types, controlling visual attention, and remembering the intent and user experience when designing graphics or interfaces. The document emphasizes testing designs with users and following established design guidelines.