Here are a few popular trading books that are available for free online: "Reminiscences of a Stock Operator" by Edwin Lefèvre "The Intelligent Investor" by Benjamin Graham "How to Day Trade for a Living" by Andrew Aziz "The Complete Trading Course" by Corey Rosenbloom "Trading in the Zone" by Mark Douglas Note: Some of these books may be available in the public domain, while others may be available as free e-books through various websites.