Build a technical documentation page HELP

Hello
I made my let’s say skeleton or basic html and css before I want to write in more details throughout the texts. Anyway, I get two errors.
First error:
You should have at least five .main-section elements that are descendants of #main-doc
Second error:
Failed:You should have the same number of .nav-link and .main-section elements.

This is the first time I post on here(at the forum). Usually I find hints and get the answer myself, but now I’m really lost and if you can’t see my code-again sorry idk how to post
And here is my code:

<!DOCTYPE html>
<html lang="en">
  <link rel="stylesheet" href="styles.css">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <head>
    <header>
      <h1>Not</h1>
      <p>Empty</p>
      </header>
  </head>
  <body>
    <nav id="navbar">
      <header>Something</header>
  <a id="navbar" href="#topic_1" class="nav-link">Topic 1</a>
  <a id="navbar" href="#topic_2" class="nav-link">Topic 2</a>
  <a id="navbar" href="#topic_3" class="nav-link">Topic 3</a>
  <a id="navbar" href="#topic_4" class="nav-link">Topic 4</a>
  <a id="navbar" href="#topic_5" class="nav-link">Topic 5</a>
</nav>

  <main id="main-doc"> 
<section id="topic_1" class="main-section">
  
  <header>topic 1</header>
  This is some text
  <p></p>
   <p></p>
    <p></p>
     <p></p>
      <p></p>
       <p></p>
        <p></p>
         <p></p>
          <p></p>
           <p></p>
</section>
<section id="topic_2" class="main-section">
  <header>topic 2</header>
  This is some text
  <p></p>
  <code></code>
  <code></code>
  <code></code>
  <code></code>
  <code></code>
</section>
<section id="topic_3" class="main-section">
  <header>topic 3</header>
 
  This is some text
  <p></p>
  <ul>
  <li>item 1</li>
  <li>item 2</li>
  <li>item 3</li>
  <li>item 4</li>
  <li>item 5</li>
</ul>
</section>
<section id="topic_4" class="main section">
  <header>topic 4</header>
 
  <p></p>
  This is some text
</section>
<section id="topic_5" class="main section">
  <header>topic 5</header>
  
  <p></p>
  This is some text
</section>
  </main>
   </body>
  </html>

One problem I see is that you have duplicate id values.
Ids should be unique and this test is expecting only one #navbar element.

Try to fix that.

Also your link and meta elements should be inside the head element block.