How do I know what protocol my router is using?

Hello there, I'm curious about something related to my router. How can I find out which protocol it's currently using? I've been trying to optimize my network settings but I'm not sure if I'm on the right track. Can you please guide me through the process of identifying the protocol my router is utilizing? It would be great if you could also explain why knowing this information is important for better network management. Thanks in advance!