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please how can i go about this,
Each .nav-link should have an href attribute that links to its corresponding .main-section (e.g. If you click on a .nav-link element that contains the text “Hello world”, the page navigates to a section element with that id)
i am stuck here i don’t know what to do again can someone help me out.

<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <link rel="stylesheet" href="styles.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>A Technical Document Page</title>
    <nav id="navbar">
      <header>JS Documentation</header>
        <li> <a class="nav-link" href="Introduction">Introduction</a></li>
       <li><a class="nav-link" href="#What_you_should_already_know"
        >What you should already know</a></li>
        <li><a class="nav-link" href="Javascript-and-java">Javascript and java</a></li>
        <li><a class="nav-link" href="Hello-World">Hello world</a></li>
        <li><a class="nav-link" href="Variables">Variables</a></li>
        <li><a class="nav-link" href="Declaring-variables">Declaring Variables</a></li>
         <li><a class="nav-link" href="#Variable_scope">Variable scope</a></li>
    <li><a class="nav-link" href="#Global_variables">Global variables</a></li>
    <li><a class="nav-link" href="#Constants">Constants</a></li>
    <li><a class="nav-link" href="#Data_types">Data types</a></li>
    <main id="main-doc">
      <section class="main-section" id="Introduction">
        <p>JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much</p>
        <p>JavaScript is a scripting or programming language that allows you to implement complex features on web pages — every time a web page does more than just sit there and display static information for you to look at — displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:
  <li> Client-side JavaScript extends the core language by supplying objects
          to control a browser and its Document Object Model (DOM). For example,
          client-side extensions allow an application to place elements on an
          HTML form and respond to user events such as mouse clicks, form input,
          and page navigation.</li>
  <li> Server-side JavaScript extends the core language by supplying objects
          relevant to running JavaScript on a server. For example, server-side
          extensions allow an application to communicate with a database,
          provide continuity of information from one invocation to another of
          the application, or perform file manipulations on a server.</li>
      <section class="main-section" id="What_you_should_already_know">
        <header><strong>What you should already know</strong></header>
        <p>This guides assume you have the following basic backgrund:</p>
          <li>The general understanding and the use of internet World Wide Web(WWW)</li>
          <li>Good working knowledge of Hyper Text Markup language(HTML)</li>
          <li>Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li></ul>
      <section class="main-section" id="Javascript_and_java">
        <header><strong>Javascript and java</strong></header>
        <p> JavaScript and Java are similar in some ways but fundamentally different
        in some others. The JavaScript language resembles Java but does not have
        Java's static typing and strong type checking. JavaScript follows most
        Java expression syntax, naming conventions and basic control-flow
        constructs which was the reason why it was renamed from LiveScript to
        <p> In contrast to Java's compile-time system of classes built by
        declarations, JavaScript supports a runtime system based on a small
        number of data types representing numeric, Boolean, and string values.
        JavaScript has a prototype-based object model instead of the more common
        class-based object model. The prototype-based model provides dynamic
        inheritance; that is, what is inherited can vary for individual objects.
        JavaScript also supports functions without any special declarative
        requirements. Functions can be properties of objects, executing as
        loosely typed methods.</p>
        <p>JavaScript is a very free-form language compared to Java. You do not
        have to declare all variables, classes, and methods. You do not have to
        be concerned with whether methods are public, private, or protected, and
        you do not have to implement interfaces. Variables, parameters, and
        function return types are not explicitly typed.</p>
      <section class="main-section" id="Hello_World">
        <header><strong>Hello World</strong></header>
        < p>
          To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code:

        function greetMe(yourName) { alert("Hello " + yourName); }

      Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!
     <section class="main-section" id="Variables">
       <p>You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.</p>
       <p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p>
       <p>You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.</p>
     <section class="main-section" id="Declaring_variables">
       <header><strong>Declaring variables</strong></header>
         you can declare a variable in three ways
       <p> With the keyword var. For example, <code>var x = 42.</code> This syntax
        can be used to declare both local and global variables.</p>
        <p>By simply assigning it a value. For example, <code>x = 42.</code> This
        always declares a global variable. It generates a strict JavaScript
        warning. You shouldn't use this variant.</p>
         <p> With the keyword let. For example,<code> let y = 13.</code> This syntax
        can be used to declare a block scope local variable. See Variable scope
      <section class="main-section" id="Variable_scope">
       <header><strong>Variable Scope</strong></header>
       <p> When you declare a variable outside of any function, it is called a
        global variable, because it is available to any other code in the
        current document. When you declare a variable within a function, it is
        called a local variable, because it is available only within that
        <p>JavaScript before ECMAScript 2015 does not have block statement scope;
        rather, a variable declared within a block is local to the function (or
        global scope) that the block resides within. For example the following
        code will log 5, because the scope of x is the function (or global
        context) within which x is declared, not the block, which in this case
        is an if statement.</p>
          <code>if (true) { var x = 5; } console.log(x); // 5</code>
This behavior changes, when using the let declaration introduced in
        ECMAScript 2015.
       <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is not defined</code>
      <section class="main-section" id="Global_variables">
       <header><strong>Global Variables</strong></header>
       <p> Global variables are in fact properties of the global object. In web
        pages the global object is window, so you can set and access global
        variables using the window.variable syntax.</p>
        <p> Consequently, you can access global variables declared in one window or
        frame from another window or frame by specifying the window or frame
        name. For example, if a variable called phoneNumber is declared in a
        document, you can refer to this variable from an iframe as
        parent.phoneNumber.                                                                                                                                         </p>
      <section class="main-section" id="Constants">
       <p>You can create a read-only, named constant with the const keyword. The
        syntax of a constant identifier is the same as for a variable
        identifier: it must start with a letter, underscore or dollar sign and
        can contain alphabetic, numeric, or underscore characters.</p>
        <p><code>const PI = 3.14;</code></p>
        <p> A constant cannot change value through assignment or be re-declared
        while the script is running. It has to be initialized to a value.</p>
        <p> The scope rules for constants are the same as those for let block scope
        variables. If the const keyword is omitted, the identifier is assumed to
        represent a variable.</p>
        <p> The scope rules for constants are the same as those for let block scope
        variables. If the const keyword is omitted, the identifier is assumed to
        represent a variable.</p>
        <code>// THIS WILL CAUSE AN ERROR function f() {}; const f = 5; // THIS WILL
        CAUSE AN ERROR ALSO function f() { const g = 5; var g; //statements</code>
         However, object attributes are not protected, so the following statement
      is executed without problems.
         <code>const MY_OBJECT = {"key": "value"}; MY_OBJECT.key = "otherValue";</code>
      <section class="main-section" id="Data_types">
       <header><strong>Data types</strong></header>
        <p>The latest ECMAScript standard defines seven data types:</p>
          <p>Six data types that are primitives:</p>
            <li>Boolean. true and false.</li>
              null. A special keyword denoting a null value. Because JavaScript
              is case-sensitive, null is not the same as Null, NULL, or any
              other variant.
            <li>undefined. A top-level property whose value is undefined.</li>
            <li>Number. 42 or 3.14159.</li>
            <li>String. "Howdy"</li>
              Symbol (new in ECMAScript 2015). A data type whose instances are
              unique and immutable.

        <li>and Object</li>
      Although these data types are a relatively small amount, they enable you
      to perform useful functions with your applications. Objects and functions
      are the other fundamental elements in the language. You can think of
      objects as named containers for values, and functions as procedures that
      your application can perform

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Why do some of these href values start with # and some don’t? Which one allows you to link to an id in the page? Seems like you should always use the one that allows that.

Falta de etiqueta de cierre, Etiqueta de apertura duplicada

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