The first step when implementing routing is to install the navi and react-navi libraries. Then, we define the routes. Follow the given steps to do so:

1. First, we have to install the libraries using npm:

> npm install --save navi react-navi

2. Then, in src/App.js, we import the Router and View components and the mount and route functions from the Navi library:

import { Router, View } from 'react-navi'
import { mount, route } from 'navi'

3. Make sure that the HomePage component is imported:

import HomePage from './pages/HomePage'

4. Now, we can define the routes object using the mount function:

const routes = mount({

5. In this function, we define our routes, starting with the main route:

    '/': route({ view: <HomePage /> }),

6. Next, we define the route for a single post, here we use URL parameters (:id), and a function to dynamically create the view:

    '/view/:id': route(req => {
        return { view: <PostPage id={req.params.id} /> }
    }),
})

7. Finally, we wrap our rendered code with the <Router> component, and replace the <PostPage> component with the <View> component in order to dynamically render the current page:

        <Router routes={routes}>
            <div style={{ padding: 8 }}>
                <HeaderBar setTheme={setTheme} />
                <hr />
                <View />
            </div>
        </Router>

Now, if we go to http://localhost:3000, we can see a list of all posts, and when we go to http://localhost:3000/view/react-hooks, we can see a single post: the React Hooks post.