Most people could avoid getting their computers/devices hacked or their website(s) getting hacked if they would just stay informed about new releases for their programs/apps!
For example, a whole lot of sites run WordPress.
And the WordPress programmers have an announcements list letting you know periodically about security updates — subscribe to it @ http://wordpress.org/list
Do the same for ANY software you use — that includes apps on your phone — if the app/software doesn’t have an announcements list to let you know about updates then you might want to think twice about installing the app/program/software!!
All the good developers who care about security provide such a service — either in the form of an email list that you can subscribe to or a RSS feed that you can load in your email reader.
Stay on top of security; just do it! 🙂