Make sure you're connected to a legitimate wireless access point. The SSID for ours is "publiclibrary".
Use current legitimate anti-virus and anti-malware (anti-spyware) software with updated definition files.
Keep your operating system regularly updated with all available security patches.
Enable (or install, if needed) legitimate personal firewall software for your computer.
When using web services (including anything you would log into such as
webmail, financial sites, and others), ensure that the site requires a secure
login. Secure logins use the "https" protocol, and are generally indicated by a "lock" icon displayed in your web browser. Secure site logins help prevent electronic eavesdroppers from learning your username and password.
Encrypt files before transferring or emailing them.
Use a virtual private network (VPN) if possible.
Be aware of people around you.
Turn off file sharing.
Password-protect your computer and important files.