Yeah, totally depends on what you're using for a router/gateway/firewall.
I've got a mix of Ubiquiti gear and pfSense. Most of it was a matter of just setting up a static route(like in the article) where when I'm on the 192.x.x.x(192.0.0.0/24) network and want to talk to 10.0.0.0/24 I'd put in the gateway(10.0.0.1) as the next hop. Without knowing more about your setup it's hard to say.
r/homelab is also a pretty decent place with a lot of helpful people interested in networking and homelabs.
Same USG here. If you're on two different networks in the Unifi setup you'll also probably need a firewall rule between them. In my case the 10.0.0.0/24 was on pfSense so the Unifi router just passed it along and didn't do anything else.
I've got a mix of Ubiquiti gear and pfSense. Most of it was a matter of just setting up a static route(like in the article) where when I'm on the 192.x.x.x(192.0.0.0/24) network and want to talk to 10.0.0.0/24 I'd put in the gateway(10.0.0.1) as the next hop. Without knowing more about your setup it's hard to say.
r/homelab is also a pretty decent place with a lot of helpful people interested in networking and homelabs.