Technical Documentation Page - Build a Technical Documentation Page. Need a hint really struggling to solve these five problems

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Challenge: Technical Documentation Page - Build a Technical Documentation Page

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You will get better feedback if you explain the exact problem , be as specific as possible then share your code so far.

The first child of each .main-section should be a header element. Can you explain me what does this mean?

This means the element in your code with the class = "main-section", the first element within it should be a <header></header> element.
Here’s an example:

<section class = "items">
  <p>Hello  Aaryaa</p> // the paragraph tag here is the first child within the . Items class.
</section>

just completed this one