If you’re not comfortable using SSH, each Linux DE comes with its own RDP setup, so refer to the docs of whichever you’re running to set that up if you want things to be super simple.

Past that, there’s tons of stuff, but I would generally avoid VNC these days because it’s pretty much a dead protocol that is insecure and inefficient.

Some people prefer to use RDP compatible tools, some people just use Moonlight. You can use whatever is comfortable for you, really. I would avoid all the suggestions that are telling you to install the giant constructs like Mesh Central though. That’s overkill for just two machines here.