How many types of heading in the HTML

There are six (6) types of headings in the HTML (Hyper Text Markup Language)

<h1>   <--  Starting tag of h1 heading --!>
</h1>  <--  Ending tag of h1 heading ---!>

<h2>   <--  Starting tag of h2 heading --!>
</h2>  <--  Ending tag of h2 heading ---!>

<h3>   <--  Starting tag of h3 heading --!>
</h3>  <--  Ending tag of h3 heading ---!>

<h4>   <--  Starting tag of h4 heading --!>
</h4>  <--  Ending tag of h4 heading ---!>
 
<h5>   <--  Starting tag of h5 heading --!>
</h5>  <--  Ending tag of h5 heading ---!>

<h6>   <--  Starting tag of h6 heading --!>
</h6>  <--  Ending tag of h6 heading ---!>