It would be impractical to put your entire app in a single component. Instead, we can import components from other files and include them in our markup.

Add a <script> tag to the top of App.svelte that imports Nested.svelte...

<script>
	import Nested from './Nested.svelte';
</script>

<script lang="ts">
	import Nested from './Nested.svelte';
</script>

...and include a <Nested /> component:

<p>This is a paragraph.</p>
<Nested />

Notice that even though Nested.svelte has a <p> element, the styles from App.svelte don’t leak in.

Component names are capitalised, to distinguish them from HTML elements.