If your goal is to extend wireless range, you just need to connect from LAN to LAN port and set the new one as Access Point.
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If it doesn't have an AP mode in the settings you can manually put it in AP mode.
https://www.cnet.com/home/internet/how-to-turn-an-old-wi-fi-router-into-an-access-point/
But since it sounds like you (OP) hasn't bought anything yet then probably easier to buy an Access Point device instead of another router.
I am building a home-lab so I am wanting to have a second network for the home-lab with out slowing down the family network so I don’t think WAPs are a option.
LAN to WAN would double NAT the network. Put router 2 in AP mode, or buy a dedicated AP as others would suggest.
lan to lan ports...
my preference would be to get a WAP, if you are wanting to extend the wifi
I don’t thinks WAPs are a option as a am looking to get a second network for my homeland.