LAN multiplayer setup help

I only ever tried once to setup and play a LAN game and it failed miserably.
On the other hand the PC that I wanted to play with was easily able to find & connect to my game via internet. The issue with that was noticeable lag even though BOTH PCs were behind the same router using the same internet connection.
I’m under the impression that it would be by far better an experience if LAN was up and running but I was unable to get that to happen. I’m semi competent with windows based PCs but much more knowledgeable with Macs. I would greatly appreciate being walked through the process, screenshots & or a video with clear and easy to follow instructions would be greatly appreciated.
Thanks in advance!

WIN+R control.exe /name Microsoft.NetworkAndSharingCenter
check Two computers’s network is private

How to change, URL
https://www.drivereasy.com/knowledge/change-network-from-public-to-private-in-windows-10-easily/
run game test

If no
WIN+R firewall.cpl
try seting Firewall GrimDawn.exe Allow access on the private network
run game test

If no
WIN+R firewall.cpl
try Disable firewall at private network
run game test

If no
WIN+R firewall.cpl
try Disable firewall at all
run game test

Remember to restore the firewall after playing the game

other
in the game
Options->Network->Network Adapter need the same
if WIFI,this is WLAN

I apologize for my poor English.
good luck!

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