If you need the to his free PDFs or spreadsheets, let me know, and I’ll point you to the official source.
It sounds like you're referring to the well-known story behind , specifically his PDFs. valuation damodaran pdf
Aswath Damodaran is a professor of finance at NYU Stern, often called the "Dean of Valuation." For decades, he has taught valuation to both MBAs and the wider world. If you need the to his free PDFs