Homelab

I'm not much of a networking person. But I understand the importance of different vlans. Currently I have 4 separate vlans that I change my PCs ip address to access If I buy a four-port nic and assign each port to a separate lan does the computer know which port to use to access the appropriate traffic or is there something else I should be doing instead?

Only the main network has access to the outside internet and it would be nice to have one system that could access everything. Or even allow my email server access to different vlans to send out alerts.

1. Main network
2. NVR & Cameras
3. KVM & IPMI
4. Various equipment

My main system is normally powered off so I wouldn't see this as an added security risk But it would definitely save some time when I sit down to check things out