Securing Proxmox GUI

I'm trying to figure out how to secure access to the web GUI i.e. how to setup networking both physical and logical. I've read all the blogs I could find on Google, posts on reddit and these forums and have read all relevant sections in the documentation (everything multiple times). However, I'm still unsure of how things work or what I should do. Not being well versed in networking and proxies doesn't help in solving this puzzle.
In my mind, the web GUI should live on a management network...

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