The simplest answer is to make yourself a difficult target.
Best case practices like patch management and using a basic firewall are easy ways to prevent basic snooping.
Having the most up to date patches installed can, more often than not, resolve a majority of basic security vulnerabilities. Patch management is as fundamental to your security posture as changing the oil in your car. Being proactive about it is the veritable low hanging fruit when it comes to filling in security cracks.
Adding a basic firewall on your network can make all the difference against malware. Most basic firewalls are equipped with stateful inspection capabilities, giving some context to packet filtering. This capability does a very good job of preventing malicious programs and files from getting in.
Encryption is something that can be done on many fronts to help lock down your information. You can use encryption services to lock down your email, browsing, and even the data on an individual computer.
It should go without saying that participating in certain social networks or sending sensitive information over email or messaging clients can equip cyber criminals with more than enough data to launch an attack. Practicing safe browsing is fundamental.
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