You start every document by writing at the top of the page: <!DOCTYPE html>. Next, you write <html>. You can put them in separate lines if it makes it easier for you, but it doesn't matter if you do because web browsers do not recognize extra lines or spaces when reading html code. Next, write <head>. This is where you put information about the webpage, called metadata. You will want to put a title for the webpage, which will display on the tab when you open it. To do this, you write <title> and your title. You have to close every tag (with a few exceptions) by rewriting the tag, but with a backslash (/) before the element name. For example, to close the <title> tag, you write </title>. You then close the head, and write <body>. This tag defines what is displayed on the actual webpage. You can create a header with the <h1>, a <h2> for a smaller header, and so on. You can create paragraphs using the <p< tag. When are done, make sure you have closed all tags, including the <p> tags, <body> tag, and the <html> tag.
Now you know how to write html. You can show your parents how much of a nerd you've become. Go out there, and start creating hundreds of boring and useless webpages, and prove that you don't have an actual life.