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 2
IP Addressing Troubleshooting
Module 3
IP Routing Fundamentals
Module 4
Single-Area OSPF Implementation
Module 5
Layer 2 Switching and STP
Module 6
VLANs and Inter-VLAN Routing
Module 7
Link Aggregation and Discovery
Module 8
Access Control Lists (ACLs)
Module 10
Essential IP Services
Module 11