It's absolutely a deep rabbit hole you could fall into. I did some very shallow research when I started my project and now I feel like I don't know a lot more than I did previously and just know a lot more about how much I don't know which means the amount that I don't know I don't know is going to be phenomenal XD

Though I guess with this kind of thing it's how much you need to be accurate, how much you want to impress people that have some idea of what's going on or how much you want it to just look good? XD

Seems like this generator does make some really nice terrains. Had a quick look at the website as I haven't tried this one and looks like it's Windows only so I guess I'll be trying to do something similar in Blender.