What are H1, H2 & so on in web design?

Sorry for the stupid question, but I notice that we talk about a lot about the importance of have the right words or title in H1 or H2. What exactly does this mean what is the relevance of it? I’m trying to build my own web site but don’t have much experience in the field.

h1 and h2 are html tags , and using them and chosing good titles increase your site SEO , which means more visitors .

The H tags are heading tags that format your text into headings. H1 is the most prominent (largest), H2 the second, and so forth. You need to mind the content of each heading tag, it's probably a good idea. What he is essentially saying is that the search engines look to these tags for relevant meaning for SEO. Don't fill them with junk, essentially. I would advise you to take help from web design tool like Topagentsite which is specifically designated for real estate investment.

h1 and h2 are tags used to turn your text to heading texts. It is used to emphasize the title of your content or text

Yes, having keyword in H tags is the second most important aspect of on page SEO these days, first being title tag...thus one has to use them properly...H1 only once for the primary word you would like to rank for and h2-h6 accordingly.

The content in your website is on more than search engine optimization. It is the voice that your company will have when it is speaking to potential clients.

h1 and h2 on page optimization seo part are html tags ,One of the key components of initial SEO planning is H1 and H2 Tag analysis.

In your webpage put H1 tag on that sentence which contain most important headline. These sentences usually specify the topic for the entire web page and are where most people look first when they're trying to figure out what the page is about.
And H2 tag is used for second most important sentence than H1 tag sentence.

H1, H2 are HTML tags that denote the font for headings in the HTML page. Headers are as important as the title tag that is located next to the meta tags before the body of the HTML code, but header tags are located within the body of your HTML code. Good designer always use H1 tags for website to make search engine friendly.
Usage example :
html-examples/h1-h2-h3-h4-h4-h5-h6-heading-html-tags-t10884.html