did I miss anything ;/ ?

Hey Saidusmon, the reason why you would use HTML tags inside the document.write() method is to write some piece of HTML to the document. You could also write plain text to the document, but there are many cases where if you do this, it won't actually resolve properly in the web browser. This is because HTML is supposed to "mark up" the text you want to put into a web page so that the browser will display it correctly.

Take for instance the sentence "Saidusmon's Website". You could add this to an HTML document using JavaScript by typing document.write('Saidusmon\'s Website'); and this would put the text in the page. However, if you wanted it to be formatted as the header for your page, it would be much better to type document.write('<h1>Saidusmon\'s Website</h1>');. In this case, you are adding an h1 element with the text you want to add already in it, and the browser's user agent stylesheet along with any other CSS you have written will format that h1 in a more appropriate way.

However, I wouldn't worry too much. As you continue to learn, you are going to find that there are better and more modern ways of adding content to a web page than the document.write() method. Just keep on progressing through the material and whenever you want to tinker with some code to see how it works, press CRTL + SHIFT + J in your Chrome browser and run your code in the Chrome console. This is a method I use pretty much every day to see how pieces of code will work, and I learn a lot by doing it. Good luck!

Note: I add a \ character inside "Saidusmon's Website" just before the apostrophe like this: "Saidusmon\'s Website". Using \ before a character like an apostrophe allows that character to properly resolve in a string. If you want to understand more, read about escape characters at https://javascript.info/regexp-escaping