Most information about ASIC technologies and semiconductor processes are not public and only supplied under strict NDAs. Therefor only very few useful tutorials about ASIC design and layout exist. Though few in number they do exist. Here are a few noteworthy ones. I did not read through them completely but only briefly skipped through them and thought they looked promising at first glance.

http://www.designinganalogchips.com/
https://www.mics.ece.vt.edu/ICDesign/Tutorials/Overview/index.html
https://web.archive.org/web/*/Designing%20Analog%20Chips