I Just want to know about website heading tags. I have a site but how to implement heading tags, Is a number of words matter in heading tags?

Heading tags are HTML elements that are used to define the headings of a webpage content. They are of six types as H1, H2, H3, H4, H5 and H6.

Heading tags, as the name implies, are tags that are used for the creations of headings. The most important tag is the <h1> heading tag, and will usually be the title of a post. Heading tags have a top-down hierarchy from <h1> to <h6>.

6 types of header tags are available <h1> to <h2>. These tags are used for creation of headings.
<h1> tag defines the primarily important heading
<h6> tag defines the least important heading

Heading tag is help you in your Off-page optimization. It is the strongest thing to make your SEO perfect. Especially H1 is a very important to increase your website visitors.

Heading Tags (H1-H6) Heading tags are HTML tags used to identify headings and subheadings within your content from other types of text (e.g., paragraph text). The hierarchy goes from H1-H6, historically in a sense of "importance." ... H2-H6 are optional tags to organize the content in a way that's easy to navigate.

Yeah we can have only 1 h1 tag and remaining can be other heading tags in a webpage.