Derived from the daily practice DigiDef has composed a few tips that can contribute to your digital defensibility.
Encrypting data and passwords really makes it harder for attackers. Encrypt your laptop, USB-sticks and mobile devices to prevent others to abuse your information in the case of theft or loss.
The content of an email message is public and can easily be red by any person. Keep that in mind when you send something to someone. If you must, you can use encryption with e-mail using PGP.
With smartphones it is possible to do all your digital things like email, banking, agenda, photos and navigation. This provides a wealth of information that can be used to determine where you live and when you are not at home. Theft of personal data happens via "fun free apps".
It is fun to share photos, using Facebook, Twitter and WhatsApp. Do realise that most smartphones save the exact GPS position in the photo. A photo of nice jewelery, car, racing bike or child then becomes a navigation guide for criminals.
If it's too good to be true, then it probably is. Don't just trust people but arrange confirmation and garantuees when you do business online.
Most free WiFi networks are not encrypted. That means literally that all of your wireless device's communication can be overheard. Make sure that your e-mail and web traffic is independently encrypted from the WiFi network. Than can be done using HTTPS, IMAPS, SMTPS, POP3S and VPN.