Patterns are solutions to common design problems that provide an ideal starting point for newcomers to design and an excellent reference for experienced designers. Some common patterns include trading cards, palettes, hub and spoke, bento boxes, search, and conversational. Patterns are used for things like content views, settings, canvas and palettes for content creation, category and detail views, elements with hot spots, and search boxes. Considerations for using patterns effectively include ensuring information is easy to grasp, focusing on content over chrome, avoiding information overload, and keeping users informed without being wordy.