Are there any good resources for xschem, ngspice for sky130. I want to simulate sky130 inverter circuit first and then build upon that to make more complex circuit.

The best person to ask is @Kunal

@User - The below analog comparator online course is designed using xschem/magic https://www.udemy.com/course/vsd-intern-analog-comparator-design-using-sky130/?couponCode=19C9C82A7FB2B21EB19A It shows all installation steps/issues faced in detail on how to configure xschem/ngspice/magic/sky130 from scratch for analog comparator design. This is quick and will save lot of time on solving issues which we have already faced while configuring, so you can start with your designs directly OR If you want to explore on your own (a bit time-consuming, but effective), you can start with below github repo for comparator and look for "comparator.sch" file in PreLayout folder: https://github.com/vsdip/avsdcmp_3v3_sky130

Thank you @Kunal, I will look into the repo.

Hi You have a course where I can learn all process for can send my project to MPW? With all flow of design ?

That would be @Matt Venn

Yes, but that's so expensive u.u, I can't

DM me if you want a discount