One of the best guides I have ever seen for protecting your privacy online is available free of charge from the Electronic Frontier Foundation (EFF). It will reduce your exposure to hackers, credit card thieves, identity thieves, and government agencies’ intrusion into your private life.
The Surveillance Self-Defense is EFF’s guide to defending yourself and your friends from surveillance by using secure technology and by developing careful practices. It is recommended reading for journalists, students, activists, protesters, corporations, non-profit organizations, and private citizens alike.
The Surveillance Self-Defense guide is an in-depth resource that explains encryption to folks who may want to safeguard their data but have little or no idea how to do it. It discusses placing locks on the doors to your home, taking extra steps to protect your privacy, every phone call, text message, email, instant message, voice over IP (VoIP) call, video chat, and social media message,
The Surveillance Self Defense guide is available at https://ssd.eff.org.