Using a specific LAN port to access LUCI/SSH

Hi, folk, I got a xiaomi 4a gigabyte edition. It has 2 ports.
I got port 2 connected to a switch and port 2 is currently unplugged (I'm connecting everything to the 6 port TP-Link switch).
Now, I want to use port 1 as an "admin port", meaning that I want to physically move to the router and plug the ethernet cable to get access to ssh/luci for better security. The port of course has to have a different IP address than port 2.
Can someone guide me a little bit? I read a bit about VLANS but it seemed extremely confusing.
Is there an easier way to achieve this?
Any tutorial that could help me in this advernture?

Thanks in advance.