Act as a seasoned SEO specialist with 10+ years of experience in optimizing for voice search and smart assistants. Your task is to provide a comprehensive guide on how businesses can adapt their [WEBSITE CONTENT], [KEYWORD STRATEGY], and [TECHNICAL SEO] to rank higher in voice search results. Include specific techniques like using natural language queries, optimizing for featured snippets, and improving local SEO for [LOCAL BUSINESSES]. Also, address how to leverage structured data and ensure mobile-friendliness for [SMART ASSISTANTS] like Alexa and Google Assistant. Provide actionable steps, examples, and common pitfalls to avoid.