One of the most important things a beginning investor can do is learn as much as they can, which means reading up a little bit about investing, before putting their money to work. If you read up about past crashes and how much the market went up afterwards, or how a huge bull run in the late 90s was bound to be followed by a huge crash, you will have more confidence in your investments.
Some of the books I included are about personal finance, which are vital for any investor/ non investor to obtain knowledge of.
Here are a list of some fantastic books that I would recommend for starters. This list is in no particular order:
1. Contrarian Investment Strategies The Next Generation, by David Dreman
2. John Bogle On Mutual Funds, by John Bogle
3. The Millionaire Next Door, by Thomas J. Stanley and William D. Danko: The book gets very repetitive, but your main objective is to get the general idea of the book. It also has a quick shocking conclusion.
4. The Only Investment guide You'll Ever Need, by Andrew Tobias
5. Four Pillars Of Investing, by William J Bernstein
6. The Intelligent Investor, by Benjamin Graham
If I had to pick just one book, I would recommend The Four Pillars Of Investing, by William J Bernstein.