how does routing traffic between interfaces occur?

I wanted to understand how the traffic is routed between two interfaces if they are on the same IP subnet.

for instance, I've a windows vm with two interfaces. first interface is connected to a DC (virtual network, no internet) and the other to the internet (home router), and they both are on a 192.168.0.0/24 network.

how does the computer know which interface to use to send the traffic? I'm able to ping my DC and reddit successfully.