Free: Look up stuff old stuff an old HP guy named Doug Rytting. Then google Keysight application notes on de-embedding. It’s all about signal flow graphs at the end of the day.
$: You could also buy this book. https://www.amazon.com/Handbook-Microwave-Component-Measurements-Techniques/dp/1119477131/?_encoding=UTF8&pd_rd_w=xd7zl&content-id=amzn1.sym.38bb2fca-b288-4f86-afed-5132328a7c6d&pf_rd_p=38bb2fca-b288-4f86-afed-5132328a7c6d&pf_rd_r=...
PS: IMS just happened last week. I literally saw grown men act as fan girls over this author. They wanted to get their book signed and have their photos taken with him. 🤷