Answers for "getting an link url for a picture online"

get featured image url

echo get_the_post_thumbnail_url();

how to add a link in image

<a href="https://www.google.com/">
        <img alt="Qries" src="https://lh3.googleusercontent.com/NGPrjka2ai0w7sfhxkxCwtOSh2wVyEZMdtrVxI4vrA22ebA_fcyl9PSvhTaCYXSWh0A68ZhvXhVZ4U-Nnp3v9IfoXg5o5H1tjjK97cs">
     </a>