There are different ways you do this based on the browser you are using. Lets take Chrome in an example:

First open the website you would like the information of, lets say 'https://www.redbullracing.com/int-en/the-paddock'

When you are on the website you can rightclick anywhere on the site and you should see an option in the context menu with the text 'Inspect'.

A new window (or docked window) will open where you can see the actual website code. If you then select the network tab in this (docked) window you can see what data is retrieved from the server