The heading tags are used in the HTML source code to indicate the different levels of titles of a webpage. The titles are indicated by the following tags: h1, h2, h3, h4, h5 and h6 (h for "heading") and have two main purposes:
Search engines give more weight to the words framed in these tags, hence their importance.
From a SEO point of view, the h1 to h6 tags that are probably the most important elements of all content of a web page, after the title tag. When they are well written, titles h1 to h6 introduce the content that follows them. They provide the most relevant terms for identifying the content of the paragraph that follows them.
In order to write optimize hn tags, the HTML standard says the following:
HOMEPAGE
<H1> CDkeys
<h2> Best sellers
<h2> Coming soon
<h2> Best bundles
<h2> Gamers Lounge
<h2> Latest Video game reviews
LISTING/CATEGORY PAGE
<H1> Name of category
<h2> Video game 1
<h2> Video game 2
<h2> Video game 3
<h2> Video game 4
EXAMPLE:
For https://www.cdkeys.com/xbox-live/games
the H1 should be XBOX LIVE GAMES
PRODUCT PAGE STRUCTURE
<H1> Name of video game
<h2> About name-of-game
<h2> System requirements
<h2> Top 3 reasons to play name-of-game
<h2> You may also like