This book is one of a series. It is free, and you can give it to your friends. See the copyright description in the first book, Bidding Notes, and a description of the other books in the series, and how to contribute corrections and new material.
All the books are available in web format, epub, or pdf, at http://pfdubois.com/publish.
This book is designed for newcomers to duplicate bridge, as a supplement to BiddingNotes. This book has small lessons on a diverse set of topics. If you do not know a term, such as “a reverse”, read about it in Bidding Notes, which has a Glossary as well.