DHS has an excellent resource: the US Computer Emergency Readiness Team (US-CERT). Their website has information ranging from Computer Security 101 to advanced information for IT professionals.

Remember: Scams, bots and viruses continue to proliferate. Use caution when opening email messages and take the following preventive measures to protect themselves from phishing scams and malware campaigns.

• Do not click on or submit any information to webpages.
• Do not follow unsolicited web links in email messages.
• Use caution when opening email attachments. Refer to the Security Tip Using Caution with Email Attachments for more information on safely handling email attachments.
• Maintain up-to-date antivirus software.
• Users who are infected should change all passwords AFTER removing the malware from their system.
• Refer to the Recognizing and Avoiding Email Scams (pdf) document for more information on avoiding email scams.
• Refer to the Security Tip Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

Other great information for non-techies from the US-CERT website.

• Top 10 Ways to Improve the Security of a New Computer Because our computers have such critical roles in our lives and we trust them with so much personal information, it’s important to improve their security so we can continue to rely on them and keep our information safe.
• Virus Basics Learn about viruses, what they can do to your systems, and how to avoid them and lessen their impact.
• Securing Wireless Networks In today’s connected world, almost everyone has at least one Internet-connected devices. With the number of these devices on the rise, it is important to implement a security strategy to minimize their potential for exploitation (see Securing the Internet of Things). Internet-connected devices may be used by nefarious entities to collect personal information, steal identities, compromise financial data, and silently listen to—or watch—users. However, taking a few precautions in the configuration and use of your devices can help prevent this type of activity.
• Staying Safe on Social Networking Sites The popularity of social networking sites continues to increase. The nature of these sites introduces security risks, so you should take certain precautions.