Sure, here is your detailed tutorial for: Understanding Nested Routes.

1. Introduction

In this tutorial, we will be exploring nested routes in Nuxt.js. Nested routes allow us to create more complex UIs by enabling a parent-child relationship between routes in a Nuxt.js application.

Tutorial's Goal

The goal is to understand how to create and utilize nested routes in Nuxt.js, and apply this knowledge in building more complex UIs.

What You'll Learn

By the end of this tutorial, you should be able to:
- Understand what nested routes are
- Create nested routes in Nuxt.js
- Understand how nested routes can be utilized to build complex UIs

Prerequisites

This tutorial assumes you have basic knowledge of Nuxt.js and Vue.js. Familiarity with JavaScript and ES6 syntax will also be helpful.

2. Step-by-Step Guide

Nested Routes Concept

Nested routes in Nuxt.js, as the name suggests, allow for nesting of routes. This is especially useful when you want to display different components based on the route's path, while keeping some parts of the UI consistent.

Creating Nested Routes

To create a nested route, you need to create a Vue file inside a directory with the same name as the parent .vue file. For example, if you have a route /user and you want to create a nested route /user/profile, you would structure your pages directory like this:

pages/
--| user/
-----| index.vue
-----| profile.vue

In this structure, index.vue corresponds to the /user route and profile.vue corresponds to the /user/profile route.

3. Code Examples

Here's a practical example using the file structure above:

/pages/user/index.vue

<template>
  <div>
    <h1>User Home</h1>
    <nuxt-child />
  </div>
</template>

The <nuxt-child /> component is where the child components will be injected.

/pages/user/profile.vue

<template>
  <div>
    <h2>User Profile</h2>
    <p>This is the user's profile.</p>
  </div>
</template>

When you navigate to /user/profile, you will see "User Home" from the parent component and "User Profile" from the child component.

4. Summary

In this tutorial, we covered what nested routes are, how to create them in a Nuxt.js application, and how they can be utilized to build complex UIs.

To continue learning about Nuxt.js, you could start exploring asynchronous data, middleware, or plugins.

5. Practice Exercises

1. Create a nested route /blog/post with "Blog Home" displaying in the parent route and "Blog Post" displaying in the child route.
2. Create a nested route /shop/product with "Shop Home" displaying in the parent route and "Product Details" displaying in the child route. Add a dynamic segment to the child route to display different products.

Solutions:
1. For the first exercise, your pages directory should look like this:

pages/
--| blog/
-----| index.vue
-----| post.vue

And the content of index.vue and post.vue should be similar to the example above, but with different text.

1. For the second exercise, your pages directory should look like this:

pages/
--| shop/
-----| index.vue
-----| _product.vue

Note the underscore before product.vue, this makes the route dynamic. In your _product.vue file, you can use this.$route.params.product to access the dynamic segment of the URL.