The most recommended resource I found was a book written by Andrew Tanenbaum. I've seen that Free Code Camp recommends: https://lagunita.stanford.edu/courses/Engineering/Networking-SP/SelfPaced/about
Does anyone know amazing computer networks online courses on a low level and/or practical level?
The links I found on HN are:
https://news.ycombinator.com/item?id=8971891
https://news.ycombinator.com/item?id=4624513
Let's make this a shared resource together! :D