Microsoft offers a free e-book about cyber security Own Your Space-Keep Yourself and Your Stuff Safe Online by Linda McCarthy. This digital book is written for teenagers and offers a solid look at using the Internet safely. It’s also a good primer on Internet security for adults.
The book covers topics like how to spot phishing tactics, how to set up your browser to protect against browser-based exploits, and how to deal with cyber-stalking and bullying. The 253-page book is a free download with a Creative Commons license (meaning you can share it rather freely). You can download the entire book at the link above or just the chapters you want to share with others.