Help me The first child of each .main-section should be a header element

</nav>
    <main id="main-doc">
      <section class="main-section" id="introduction">
        <header> Introduction</header>
         <p>JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.</p>

What is this related to? Do you have more code somewhere?

simple u are there
just make another header elements in the rest of four .main-section elements
since it says “each .main-section”

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