There are 6 tags that define a heading in HTML. These tags are designated from H1 to H6. By default, the H1 tag is the largest or most important heading while the H6 is the least. All of these tags are supported by all major browsers.
As with all search engine optimization efforts, no matter how small or seem insignificant, proper programming and page layout, aside from providing informative and effective content should always be practiced. Headings are generally used to define the content of the page and for proper page layout. Every written content or article should have proper headings.
The H1 tag can and is still widely used for effective SEO up to now. Always consider the use of the H1 tag properly in your web page or blog post. It is used to describe a page so make sure you put the right text, or keywords, wrapped in your H1 tag that best describes what the page is all about. Although humans might not put that much value to these headings, search engine robots do. It is one of the things that helps assist a bot by telling it that the words within the tag is important to the whole content of the page. As a rule, there should only be one H1 tag used throughout the entire page. If you should need more headings within your written content, assign to it the other heading tags. That is why there are 6 defined heading tags after all.
Of course text within the H1 tag doesn’t have to look that big and awkward as the default HTML implementation goes. You can simply define it in your cascading style sheet (CSS) so that it will go smooth and natural to your page’s layout.