HTML stands for hyper text markup language. It is the language we all learn to design web sites. HTML is the used to structure web pages and layout content, be it paragraphs or headings.
Fortunately, Microsoft has made it quite simple to design a web site with just a working knowledge of HTML and CSS. You do not need to write your own code, so there is no memorization required of all the HTML attributes, etc.
However, you do need to know how and when to apply various tags. Learn about HTML Tags.