The 5 on-page signals that matter most
1) Title tag — 50-60 chars, primary keyword near the front, click-worthy. 2) H1 — one per page, related to but distinct from the title. 3) Meta description — 140-160 chars, includes keyword, drives click-through. 4) Heading hierarchy — H2 for sections, H3 for sub-sections, logical structure. 5) Internal links — 3-10 contextual links to other relevant pages on your site.
Get these five right on every page and you've done 80% of on-page SEO.