Okay I went through @User’s intro (https://github.com/bluecmd/learn-sky130/blob/main/schematic/xschem/getting-started.md) I can now actually plot currents! That's an improvement 🙂 What I have not yet figured out is how I can plot other expressions. Like (V(n1)-V(n2))/I(R4) or whatever. And in general how to do more complicated stuff than just transient and AC simulations. Stuff like operating points, S-parameters, IIP3, monte-carlo simulationts, etc. I recall someone mentioned doing monte-carlo with a loop in spice, so this is why I was asking about good resources to learn spice, because most material just covers how to do something in one particular GUI, and the open source tools don't seem to have a GUI for these things.