Don’t be a soft target. This is the most important rule of all. Use HTTPS/TLS for everything. Wi-Fi networks are becoming ubiquitous, and a lot of people don’t think twice to hop on an open Wi-Fi network and browse away. Big mistake, especially when traveling overseas. Choosing convenience is a trap that catches a lot of flies. Same with the cellular networks – they are easily exploited.
Use a VPN client for your laptops and mobile devices. The good news here is that we are in the middle of a price war between various providers. I use Cloak, but there are other similar solutions out there. Do your research, and pick the one that works for you. It is money well spent.
Learn how to use the Tor network. It’s a powerful tool. There is a bit of a learning curve, but as of now, it is without equals in terms of giving an edge to the privacy minded. Take a look at the interactive infographic by The Electronic Frontier Foundation to see why Tor is important (or click the image below):
Lastly, remember that as in any arms race, the balance of measures/countermeasures is constantly shifting. Stay informed, evolve, and adapt.