You can trust the “experts” that populate Facebook.
Or you can take An Introduction to Computer Networks from Stanford University.
This is an introductory course on computer networking, specifically the Internet. It focuses on explaining how the Internet works, ranging from how bits are modulated on wires and in wireless to application-level protocols like BitTorrent and HTTP. It also explains the principles of how to design networks and network protocols. Students gain experience reading and understanding RFCs (Internet protocol specifications) as statements of what a system should do. The course grounds many of the concepts in current practice and recent developments, such as net neutrality and DNS security.
I expect the Stanford University course will be much more informative, although possibly not as much fun as Facebook.