Better understand how internet works

I'm looking for an online course / reading material to better understand how the Internet is organised. I have no problem using the Internet, but there are many seemingly basic concepts that I don't understand, such as webserver, ISP provider, web hosting provider, internet protocols, and many more. I have found that looking up all these concepts one by one on Google only leads to further questions and believe that a single comprehensive material will be more helpful.

The reason why I want this is primarily general interest.