There are tons of tutorials out there and I picked only the ones that are both practical, comprehensive and user-friendly:
svelte-grid - A responsive, draggable and resizable grid layout, for Svelte
Vime - Focused on making embedding and using media elements for the web simple
svelte-mui - A set of Svelte UI components inspired by Google's Material Design
svelte-component-template - A base for building shareable Svelte 3 components
svelte-loader - Webpack loader for Svelte components
svelte-routing - A declarative Svelte routing library with SSR support
svelte-inetllij - Provides syntax highlighting of Svelte components in WebStorm and friends
@testing-library/svelte - Simple and complete DOM testing utilities that encourage good practices
svelte-apollo - Svelte integration for Apollo GraphQL
Search repos more here
Explore some basic code examples
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