Summarize this article in one sentence.
HTML code is made up of open and closed tags. Every well-written HTML page should start with <!DOCTYPE html>. This tells a web browser that the HTML file is an HTML file. This is the opening tag of your HTML code.  This tells the browser your HTML code starts here. This is the opening tag for the Head of the HTML document.  The head contains meta information that is not displayed in the web browser.  This contains information such as the page title, it also contains the Cascading Style Sheets (CSS) which format the look of the HTML code. This is the HTML code that contains the page title of your web page.  The "<title>" tag is the opening tag of the Page title HTML code.  The "</title>" of tag is the closing tag.  Replace the text "Page Title" with any title you want name your HTML page.  This text will appear in the browser tab at the top of the web browser. This is the tag that closes the head of your HTML document.  If you wish to include any other information or style sheets for your HTML document, be sure to write them after the "<head>" opening tag, and before the "</head>" closing tag. This is the opening tag for the body of your HTML document.  The body is where all the visual elements of your web page go.  This includes text, images, buttons, and other elements that are viewable on the web page. This is the HTML tag to add a background image to your web page.  Replace "[image url]" with the actual url location of the image you want to add.  This can be the location of an image that is uploaded to an online server, or the local location of an image on your computer.   Alternatively, you can use CSS to set an background image. When you use a filename without a file path or URL (i.e, background-image: url("background.png");), the web browser will look in the web page folder for the named image. If the file is in another folder on your file system, you'll need to add the full path to that file. If you wish to include any other HTML elements on your web page, such as text, images, videos, links, buttons, etc, be sure to including them in the "Body" section of your  HTML document. This is the tag that closes the body of your HTML document.  When you are finished adding all HTML elements you want to include in your document, type this tag on the last line. This is the tag to close your entire HTML document.  Type this tag on the last line. When you are finished with everything, click File and then Save to save your work.  Your entire HTML document should look something like this:   <!DOCTYPE html> <html> <head> <title>Page Title</title> </head> <body> <div style="background-image: url('https://www.website.com/images/image_background.jpg');"> </body> </html>

Summary:
Type <!DOCTYPE html> at the top of the HTML document. Write <html> in the next line. Type <head> in the next line. Type <title>Page Title</title>. Type </head> in the next line. Type  <body> in the next line. Type <div style="background-image:url('[image url]');"> in the next line. Finish the rest of your HTML document. Type </body> in the last line. Type </html> at the very end. Save the HTML file.