What does the span tag means and why it is being ude only in headings tag?

Answer 1

This explains the span tag Daksh Verma
https://www.w3schools.com/tags/tag_span.asp

Also, the span tag is not specifically for headings

Answer 2

Also Daksh Verma this Sololearn lesson teaches it on the bottum of the first page.

Click here to visit lesson:
https://www.sololearn.com/learn/HTML/1034/