In each website there is a section near the top of the code where keywords are listed for the webcawlers to include in their index. See below as an example for a website:
Website is:
www.knightforhire.com
Here is some of the html code:
<!DOCTYPE html> <html lang="en"> <head> <title>314 308 7075 - Home</title> <meta name="keywords" content="knight, armor, kindt, karl, knightforhire, chivalry, stories"> <meta name="description" content="Knightforhire.com"> <meta property="og:url" content="//knightforhire.com/index.html"> <meta property="og:title" content="Home"> <meta http-equiv="last-modified" content="2018-07-31 @ 15:33:30 UTC"> <meta property="og:description" content="Knightforhire.com"> <link rel="canonical" href="//knightforhire.com/index.html"> <!-- Load react core --> <script type="text/javascript" src="https://unpkg.com/react@16.5.2/umd/react.production.min.js"></script> <script type="text/javascript" src="https://img-fl.nccdn.net/Shared/Scripts/fat_core.EN.js?V=7bd40f1"></script> <script type="text/javascript">