Start with high-confidence business valuation books, then narrow by subgenre or adjacent topics.
Financial Statement Analysis for Value Investing
Stephen Penman, Peter F. Pope
Financial Modeling, Fifth Edition
Simon Benninga, Tal Mofkadi
Value
McKinsey & Company Inc., Tim Koller
Venture Capital Due Diligence
Justin J. Camp
The Corporate Life Cycle
Jonathan Beville, Aswath Damodaran
Corporate Finance for Dummies
Michael Taillard
Valuation
Corporate Finance
Pierre Vernimmen, Pascal Quiry
The Credit Investor's Handbook
Michael Gatto
Business Valuation
NACVA, Lari B. Masten