There should be <html> in the first tag in any html document. It will let the web browser know that it is an HTML file. Otherwise, there is no chance that the browser will know that it is an HTML file. And all the other options are tags that have to be used later after the tag.
All web developers have to use HTML (Hyper Text Markup Language) extensively, regardless of whichever framework or backend language you choose. If you use JavaScript frequently, check my recent blog.
HTML is the most basic building block of the Web. It defines the meaning and structure of web content. Other technologies besides HTML are generally used to describe a web page’s appearance/presentation (CSS) or functionality/behavior (JavaScript). it is the language for describing the structure of Web pages. it gives authors the means to: Publish online documents with headings, text, tables, lists, photos, etc. Retrieve online information via hypertext links, at the click of a button.

All HTML documents must start with a document type declaration: <!DOCTYPE html> . The HTML document itself begins with <html> and ends with </html> . The visible part of the HTML document is between <body> and </body>
If you prefer to code HTML by hand, you can use a simple text editor to create web pages. Brackets is an excellent free HTML editing application from Adobe available for both Windows and Mac. Common text editors for Windows include Notepad and WordPad; both programs are standard in Windows
An HTML tag is a special word or letter surrounded by angle brackets, < and >. You use tags to create HTML elements, such as paragraphs or links. Many elements have an opening tag and a closing tag — for example, a p (paragraph) element has a <p> tag, followed by the paragraph text, followed by a closing </p> tag.
For Example. take the following line of content:

What is the full form of html?
HTML, in full hypertext markup language, a formatting system for displaying material retrieved over the Internet. HTML can only create static web pages. For dynamic web pages, other languages have to be used eg. C, C+, C#, Java, visual basic, PHP, Python, JavaScript, SQL etc.
You can learn HTML without having to go to a college or a boot camp. In fact, you can learn HTML at the comfort of your own home. However, you will need learning materials to enable you to learn effectively. Fortunately, there are a lot of websites and online courses that can help you learn. Codecademy has numerous free programs to provide you with the technical skills you need. Over 50 million students have used Codecademy, W3schools to learn basic HTML and coding.
What does html stand for?
HTML code ensures the proper formatting of text and images for your Internet browser. Without HTML, a browser would not know how to display text as elements or load images or other elements. HTML also provides a basic structure of the page, upon which Cascading Style Sheets are overlaid to change its appearance.

Html web page examples with source code | HTML Document
To view only the source code, press Ctrl + U on your computer’s keyboard. Right-click a blank part of the web page and select Page source from the pop-up menu that appears.
Here are the best free code sample websites to start with. We’ve narrowed things down to a few of our favorite places to start.
Stack Overflow. …
SourceForge. …
CodeGuru. …
CodeProject. …
DevX. …
The GNU Free Software Directory. …
Google Open Source.
Summary
HTML (Hypertext Markup Language) code ensures the proper formatting of text and images for your Internet browser. Without HTML, a browser would not know how to display text as elements or load images or other elements. It also provides a basic structure of the page, upon which Cascading Style Sheets are overlaid to change its appearance. One could think of HTML as the bones (structure) of a web page, and CSS as its skin (appearance).
Also Read What is python programming language