Looking to replace an ISP (Verizon FIOS) router/extender setup. I have an idea where I want to be, but so much confusion surrounds it all!

[MOEB74]

China and north Korea is just a joke I'm not paranoid , run a simple system and lock it down tight . yes guest network will keep infected gevices away from the main network , in theory . Works for me I am no longer in the business of setting up and maintaining networks . Retired years ago . There is plenty of good advice here
Good luck

Thanks!!