What are the basic on-page SEO things I must get right?
Put your target keyword in the title tag, H1, URL, and naturally in the content; write a compelling meta description; make the page fast and mobile-friendly. Match the search intent, give people what they actually came for. Nail these fundamentals before worrying about anything advanced.
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Ahrefs' official, regularly-updated SEO fundamentals guide, a canonical primary source, not blogspam, covering the five things that actually matter.