How to put Debian's console on a HDMI monitor


Recently I’m trying to figure out how the Linux handling display. So I’m starting from putting a console on the Poplar board’s HDMI port, using the Debian release (not Android). I imagined after getting a console, maybe some kind of GUI is possible…
But I can’t find much useful info online, most of them are talking about Ubuntu on x86 platform. I tried add console=tty0 into cmdline, but got nothing on my monitor. This document said when console=tty0, the system will put console on VGA card, but how the system decides which VGA card to use?

So can anyone share a brief guide on how to achieve this, or just point out a direction I can dig in.
I really have no experience on this topic, any help would be appreciated…
Thanks a lot !