[mitchelldeacon9]

Many contributors to this thread justifiably recommend this book, which is an excellent introduction to finance:

Graham, Benjamin and Jason Zweig (2006) The Intelligent Investor, revised ed.

I would also suggest the following books, which offer more in-depth analysis of financial markets and securities:

Henwood, Doug (1997) Wall Street: How It Works and for Whom

Lynch, Peter and John Rothchild (2000) One Up on Wall Street, 2nd ed.

Mishkin, Frederic (2018) Economics of Money, Banking and Financial Markets, 12th ed.