What is the use of H1

[AbhinayaSree]

H1 will make the search engine to highlight the particular keyword easily.

[vikasbook]

H1 tags are best practice to optimize on page of site which is specialy tell about page and its nice place where one can add their main keywords and even search engine give more weight to these meta

[MySEOfootprint]

Put one of your main keywords in the H1 which google puts a high emphasis on from an seo perspective

[andrew109720]

Proper Use Of H1, H2, H3, H4, H5, H6 header elements. The six heading elements, H1 through H6, denote section headings.

[johnsteve108]

H1 tag can be used many times on a web page, but it also decides a external section of the site. With regards to the site type and structure, there may be several areas, so it can be pretty handy.

[warriorwithin]

Originally Posted by softprerna

The <h1> to <h6> tag is used to define html headings
<h1> defines the most important heading and <h6> defines the least important heading.

Yes,he is absolutely right that there are 6 headings in HTML and H1 is the top heading and H6 is the least one.