Landmarks and heading order

What this means

Landmark elements such as header, nav, main, aside, and footer identify major page regions. Headings create a logical outline inside those regions.

In beginner terms, this topic answers one practical question: "What should I write, and why does React care about it?" Do not try to memorize the syntax first. First understand the idea, then connect the syntax to that idea.

Why it matters

Semantic landmarks and ordered headings improve keyboard navigation, screen-reader use, maintenance, and search understanding.

When you build real React screens, this idea helps you decide where data should live, what the user should see, and what should happen after an interaction. That is why this lesson is part of the main path instead of being an optional detail.

Step by step

1. Notice the UI problem this topic solves. 2. Look at the smallest possible example. 3. Change one value and predict what should appear. 4. Run the example and compare the result with your prediction. 5. Use the practice task before moving on.

Small example

<header>...</header>
<main><h1>Track</h1><section><h2>Lessons</h2></section></main>

Common mistake

Do not skip heading levels just to get a smaller font. Use CSS for appearance.

Practice task

Build a small learning page with header, navigation, main content, two sections, and a footer.

Remember this

Use landmarks for regions and headings for the content outline.