Making A Short Hike Inspired Unlit-ish Shaders

This is the kind of shader I would like to make, and he shows much of the information for how he did it, such as the custom lighting ramp and the different inspector values he could adjust.

I only have a passing knowledge of how programming stuff works, and I have no idea how I’d go about doing this. Could somebody give me a step-by-step on how this could be achieved? I’d like the same adjustable values and a slightly darker lighting ramp.
I’ve spent all day trying to learn how I could achieve similar, but I’ve so far not had much luck, and I don’t know how to make things editable in the inspector of the material like it is for his shader.

Sorry if this sounds really dumb and vague, I’m just totally at a loss of how to go about it. I’ve been given examples and I can kind of see what they mean, and I’ve tried to follow along with tutorials, but I just can’t achieve what he’s managed to do.

Sorry, the time didn’t save in the link - he speaks about what I’m discussing at 6 minutes and 35 seconds.

You can start by following a cell-shading tutorial for URP, like this one for example:

Then use the math that’s shown below each ramp in the video you posted to adjust the results as needed, or edit the math a bit so it looks the way you want.