Hardware for mining

I am a newbie. For running multiple miners at once, what do you recommend a router, modem or
router/modem combo?

When it comes to your network you can pretty much go any way you want as long as the internet itself is reliable. I wouldn’t focus too much on the hardware as long you understand the concept of how your modem/router operates. If you have any specific questions about which model for the type of internet you’re subscribed to just message me. I do that stuff for a living