Before doing research on how to configure the Raspberry Pi, I need some help knowing what the role of the Raspberry Pi, in this set up, is called.
I suspect its this one; https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md. But it might also be something like this; https://medium.com/@edoardo849/turn-a-raspberrypi-3-into-a-wifi-router-hotspot-41b03500080e
Note: In the network schema, the rest of the network users are connected by WiFi.