Dedication

This book is dedicated to all of you who have generously made available your resources and ideas so that all of us could learn and improve.   These include text book authors, editors, users, and those with free content online.

This book is also dedicated to all of you who power, edit and help maintain sites like Wikipedia (Wikimedia Media Foundation), Stack exchange, Quora and other places where information can be sought and exchanged easily and freely.

I also thank my family for their encouragement.