<title> in the <head> The HTML document needs a title tag. That’s what the user sees as the name of the tab where the page is being rendered by the browser. You want it to be informative. It should contain the name of the collection (the website) and the name of the document (specific page being displayed).
Common mistakes include to leave it as <title>Untitled Document</title> or not to include the name of the collection. You don’t want a page with a title that reads only “About”, when it should be very clear which website it belongs when you see the tab.