w3c html validation error – Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections

Either:

1. Add a heading (h1, …, h6) tag to your section element.
2. Replace your section element with a div element.
3. Ignore the warning. The message you’re seeing is a non-normative usage recommendation, as per the HTML5 spec (highlighting mine):
   

   The theme of each section should be identified, typically by
   including a heading (h1–h6 element) as a child of the section
   element.