How to use inspect element to find answers?

As we know that everything on the internet is attached with coding and there are a lot of codes and programs behind every element we see on the internet. As there are many different languages available which may be responsible for the backend coding and designing of these websites but PHP, Javascript, HTML and CSS are on the top of the list of the languages which contribute to the backend of the web designing. As you can see what is happening behind the curtain while I am writing this blog post.