Someone wanted to learn this too, so Grasp built them a personal learning path.
You can keep exploring this one or create a path like this one shaped around you.
Recommended resources
Module 1
Network Fundamentals
Module 2
Network Models and Data Flow
Module 3
IP Addressing and Subnetting
Module 4
Transport Layer: TCP & UDP
Module 5
Core Network Services
Module 6
Switching and Routing
Module 7
Common Network Attacks
Module 8
Fundamental Network Defenses
Module 9
Practical Network Troubleshooting
Module 10