Connecting jQuery
First, we need to download jQuery from the official site. Then put the resulting file in the folder with your site and connect it like this:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="path to file with jQuery"></script>
</head>
<body>
</body>
</html>
Once connected, you can start writing code using this library.