Check out example codes for "head tag html". It will help you in understanding the concepts better.

Code Example 1

<meta name="author" content="John Doe">

Code Example 2

<meta http-equiv="refresh" content="30">

Code Example 3

<html>
  <head>
    <title>I am a title so i got to be in head</title>
  </head>
</html>

Code Example 4

<meta property="og:image" content="https://developer.cdn.mozilla.net/static/img/opengraph-logo.dc4e08e2f6af.png">
<meta property="og:description" content="The Mozilla Developer Network (MDN) provides
information about Open Web technologies including HTML, CSS, and APIs for both Web sites
and HTML5 Apps. It also documents Mozilla products, like Firefox OS.">
<meta property="og:title" content="Mozilla Developer Network">

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