<pre><code>echo &quot;Hello world&quot;</code></pre>

        <p>Your terminal will repeat "Hello world" back to the screen. The <code>echo</code>
          command just tells your terminal to repeat the words you typed. Not too
          impressive just yet, but it turns out the terminal can do a lot more!</p>


        <h2 id="the-filesystem">The Filesystem</h2>


        <p>On Windows or MacOS, you are probably familiar with folders and files,
          with which you can interact by dragging and droppin