Lesson 03: Page Optimization

On-Page SEO

On-page SEO covers the elements that appear within a webpage and help communicate what the page is about, how its content is organized, and which topics are most important.

Search engines use page titles, descriptions, headings, links, images, and other signals to understand and process page content. Clear on-page optimization also helps visitors navigate and understand the information on a page.

In this lesson, you’ll learn how to review the core page-level elements that influence search visibility and usability.

Start with titles What you’ll learn

5 short lessons. Beginner friendly. Part of SEO Fundamentals.

Your learning path 5 lessons
01
TitlesTitle tags and primary topic
 02
Meta descriptionsSummaries and search snippets
 03
HeadingsH1 to H6 and page hierarchy
 04
Internal linksAnchor text and crawler discovery
 05
ImagesAlt text, filenames, and dimensions
One element per lessonWork through them in order, or start with the element your audit flagged.

Lessons 01 to 05

What you’ll learn

Each lesson focuses on one page-level element and explains the role it plays for search engines and visitors.

01Relevance

Titles

How title tags describe a page and help search engines and users understand its primary topic.

  • Title tags
  • Primary topic
  • Title length
  • Duplicate titles
  • SERP title links
Open lesson
02Presentation

Meta descriptions

How meta descriptions summarize page content and can influence how a page is presented in search results.

  • Meta descriptions
  • Search snippets
  • Click-through rate
  • Missing descriptions
  • Duplicate descriptions
Open lesson
03Structure

Headings

How H1 through H6 headings organize content and establish a clear page hierarchy.

  • H1 tag
  • H2 to H6
  • Heading hierarchy
  • Content outline
  • Skipped levels
Open lesson
04Navigation

Internal links

How links between pages help users navigate a website and help crawlers discover related content.

  • Anchor text
  • Link discovery
  • Orphan pages
  • Broken links
  • Related content
Open lesson
05Media

Images

How image filenames, alt text, dimensions, and surrounding content contribute to accessibility and page understanding.

  • Alt text
  • Image filenames
  • Width and height
  • Surrounding content
  • Accessibility
Open lesson

Context

Why On-Page SEO matters

A technically accessible page can still be difficult for search engines and visitors to understand if its content structure is unclear.

Effective on-page optimization connects the topic, content structure, and supporting elements of a page. Each element should serve a clear purpose rather than being optimized in isolation.

In SiteAuditLint

Find page-level issues across a crawl

SiteAuditLint can help identify page-level issues across a crawl, making it easier to find missing, duplicate, or inconsistent elements that need attention.

Use the findings to review pages individually, identify patterns across the website, and prioritize changes that improve the overall quality of the site.

Before moving on

Lesson checklist

Make sure you understand:

  • What a title tag communicates
  • What a meta description is used for
  • How headings establish content structure
  • Why internal links matter
  • How images should be optimized and described

Summary

Key takeaway

On-page SEO brings together the visible and HTML elements that explain a page to both people and search engines.

The next lessons examine each element in more detail, starting with titles.

Continue to titles
Part of SEO Fundamentals. Return to the SEO Fundamentals overview, or review Technical SEO to make sure your pages can be crawled and indexed before optimizing them.