Netgate 4100 and LAN1 <--> LAN2

[Airone 0]

Hello,
I don't know Pfsense and I'm having some problems with the settings. I have a Netgate 4100 with two LANs configured. Each of the LANs is used for different types of services and users. I would like the two LANs to be able to communicate freely with each other without any limits (like a single LAN), considering that in Internet (WAN) they will have different configurations. I repeat, I don't know Pfsense and even less Netgate operationally, so I would need some step by step help to configure LAN1 <--> LAN2.
Thanks in advance.

[SteveITS]

@Airone-0 This should help:
https://docs.netgate.com/pfsense/en/latest/solutions/netgate-4100/opt-lan.html

If your LAN2 already exists just skip the part about creating OPT and assume LAN2 when they reference OPT.

The subnet for LAN1 and LAN2 must be different.

[Airone 0]

Very helpful, thank you.