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Learn to identify and avoid five common CSS mistakes that frequently appear in web development projects through this 13-minute tutorial. Discover how to eliminate useless declarations that add no value to your code, understand the importance of working with browser defaults rather than fighting against them, and master techniques for staying organized while refactoring your stylesheets. Explore why removing focus outlines creates accessibility issues and how to maintain them properly, plus gain insights into selecting the appropriate CSS tools and techniques for specific layout challenges. The tutorial covers practical examples of each mistake with clear explanations of better alternatives, helping you write cleaner, more efficient CSS code that follows best practices and improves both performance and maintainability.