Yes, a hacked website can happen to your school. Here, the myths, misinformation, and truths. Plus, tips for protecting yourself.

If you surfed the Internet in 1994, you could probably have gone to all 3,000 websites. (And back then, a hacked website was rare.) Today, you’d be hard pressed to visit even a tiny fraction of the billion-plus sites out there.

Exponential growth has come at a price: About one percent—or ten million—of these websites are hacked or infected.

While your ...