Prompt: Can you provide a comprehensive guide on improving the digital presence of a small business, including detailed steps, analysis, and best practices? Please cover various aspects of digital marketing such as website optimization, search engine optimization (SEO), social media marketing, email marketing, and online advertising. Additionally, can you provide examples of successful digital marketing campaigns implemented by small businesses, highlighting what made them successful? Can you also discuss how to track the performance of digital marketing campaigns, and offer guidance on how to make data-driven decisions to improve digital marketing results?