Using a Wired Network | Adafruit's Raspberry Pi Lesson 3. Network Setup | Adafruit Learning System
Raspberry Pi as a router using a single network interface
Setup a Raspberry Pi Wireless Access Point - The Geek Pub
Amazon.com: Seeed Studio Mini Router with Raspberry Pi CM4 4GB RAM/32GB eMMC and a Case, Dual Gigabit Ethernet NICs, OpenWrt Pre-Installed, I/O Peripherals with Aluminum Heatsink for Camera Projects. : Electronics
RouterPi - A Compute Module 4 Router | Zak's Electronics Blog ~*
Network interface routing priority on a Raspberry Pi | Jeff Geerling
Raspberry Pi Wireless Access Point - Pi My Life Up
networking - How to make Raspberry Pi to receive an IP from a router and also pass another IP to another device? - Unix & Linux Stack Exchange
Setting up a Raspberry Pi with 2 Network Interfaces as a very simple router | Jeff Geerling