A person can find a Google Banner Ads Guide on the Google Ads Help Center website. The Google Ads Help Center provides comprehensive resources, including step-by-step guides, tutorials, and best practices for creating and managing banner ads. Additionally, Google offers various educational resources, such as the Google Ads Academy, which provides courses and certifications related to advertising on Google's platforms. These resources can help individuals learn about the different ad formats, design guidelines, targeting options, and optimization strategies specifically related to banner ads on Google.