how to add a html page link in php code example

Example 1: how to make links in html

<a href="link.html"> text link </a> <!-- link to html -->
<a href="google.com" URL> Google </a> <!-- link to site -->
<a href="link.html"><button> Link </button></a> <!-- Button link -->

Example 2: link to another page php

echo ' <a href="index1.php">page1</a>';
echo '<a href="page2.php">page2</a>';