Act as a seasoned content marketing strategist with 10+ years of experience in business planning. Provide a detailed guide on best practices for integrating content marketing into business planning, ensuring alignment with [COMPANY GOALS], [TARGET AUDIENCE], and [BUDGET CONSTRAINTS]. Cover key areas such as content strategy development, SEO optimization, audience engagement, and performance measurement. Include actionable steps for creating a content calendar, leveraging [SOCIAL MEDIA PLATFORMS], and repurposing content efficiently. Highlight common pitfalls to avoid and how to adapt strategies based on [MARKET TRENDS]. Use real-world examples where applicable.