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Domain Authority (DA) is a Moz metric (1–100) predicting how well a domain ranks in search engines. It considers linking root domains, total links, and MozRank. DA is NOT a Google metric — Google uses PageRank (internal, not public). Use DA for relative comparison between sites, not as an absolute target.

Avoid targeting specific keyword density — modern SEO focuses on topical relevance, not keyword stuffing. Google's algorithms detect unnatural repetition. A density of 0.5–2% is generally natural for a main keyword. Focus instead on: comprehensive coverage of the topic, related terms (LSI keywords), and user intent matching.

Word count depends on the topic and search intent. Informational topics: 1,500–3,000 words to cover comprehensively. Short-answer queries: 300–800 words. Pillar pages: 3,000–7,000 words. Tool pages: 500–1,500 words. Match the length to what top-ranking pages show — that reveals what Google considers comprehensive for that query.

Google displays ~50–60 characters before truncating title tags in SERPs (about 600px width). Aim for 50–60 characters. Include the primary keyword near the beginning. Use separators (| or —) to separate brand name. Titles over 60 characters aren't penalized but will be truncated in search results.

A canonical URL (<link rel="canonical" href="...">) tells search engines which URL is the "master" version when multiple URLs have similar or duplicate content. Example: https://example.com/page/ is canonical over https://example.com/page/?utm_source=fb. Without canonicals, duplicate content splits link equity across URLs, weakening rankings.