Here are some titles I referred to when building my own portfolio.
The Bogleheads’ Guide to Investing
Mel Lindauer, Taylor Larimore, Michael LeBoeuf
Need to make sense of the concept of investing? Start here.
The First Time Founder’s Equity Bible
Gerry Hays and Ashton Chaffee
Written from the founder’s viewpoint. This is a useful shorthand guide to private equity investing.
The Intelligent Investor
This book is famous for a reason. A foundational text for value investing.
Brad Feld and Jason Mendelson
Thinking of investing your money in startups and small businesses? Start here.