Act as a professional resume writer with 10+ years of experience in crafting ATS-friendly resumes. Provide a detailed guide on best practices for structuring resume headings to maximize readability and impact. Cover the following aspects: [1] Optimal formatting (font size, style, alignment), [2] Essential sections to include (e.g., 'Work Experience' vs. 'Professional Experience'), and [3] How to tailor headings for [specific industries] like [tech, healthcare, or finance]. Also, address common mistakes (e.g., overly creative headings) and how to avoid them. Use examples for [entry-level], [mid-career], and [executive] candidates.