Basic elements are the backbone of any HTML document. You'll see these elements in the source code for all web pages, following the doctype declaration, which is on the first line of the page.
The HTML <html> element (or HTML root element) represents the root of an HTML document. All other elements must be descendants of this element.
<base>The HTML <base> element specifies the base URL to use for all relative URLs contained within a document. There can be only one <base> element in a document.
<head>The HTML <head> element provides general information (metadata) about the document, including its title and links to its scripts and style sheets.
<link>The HTML <link> element specifies relationships between the current document and an external resource. Possible uses for this element include defining a relational framework for navigation. This Element is most used to link to style sheets.
<meta>The HTML <meta> element represents any metadata information that cannot be represented by one of the other HTML meta-related elements (<base>, <link>,<script>, <style> or <title>).
<title>The HTML <title> element defines the title of the document, shown in a browser's title bar or on the page's tab. It can only contain text, and any contained tags are ignored.
The <body> element defines the document body.