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<nav id="navbar" Introduction

What you should already know JavaScript and Java Hello world Variables

that’s a lot of problems.
Maybe we can help you get started with this one but can you do one thing first?
Please indent your code properly.
Once it is done, update the post with the new indented code.

thanks in advance

I have try it again but i still have a lot errors

<!DOCTYPE html>
<html lang="en">

</html>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="stylesheet" href="name">
<main id="main-doc"><main>
<body>
   <section id="introduction" class="main-section">
      <header>
      <nav id="navbar"
      Introduction</header><section>
      <p></p>
      <p></p>
      <p></p>
      <p></p>
      <p></p>
      <p></p>
      <p></p>
      <p></p>
      <p></p>
      <p></p>
      <code></code>
      <code></code>
      <code></code>
      <code></code>
      <code></code>
      <ul>
         <li></li>
         <li></li>
         <li></li>
         <li></li>
         <li></li>
      </ul>
      </nav>
   <section id="what_you_should_already_know" class="main-section">
      <header>What you should already know</header><section>
   <section id="javascript_and_java" class="main-section">
      <header>JavaScript and Java</header><section>
   <section id="hello_world" class="main-section">
      <header>Hello world</header><section>
   <section id="variables" class="main-section">
      <header>Variables</header><section>
      
</body>

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').

put all your code inside the html element (indented inside)