I just got done adding VLANs to my network in preparation for a huge jump into home automation. My main goal is to isolate my Guest and DMZ VLANs from my secure native network. I have been searching and reading a lot over the past few days and much of the information I am finding is targeted towards how to setup certain rules but before I start just implementing a bunch of rules I am looking to understand why I need the rules. I really need an ELI5 resource for firewalls. Any suggestions would be helpful.
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