Useful websites

Below are many websites which provide useful information for security practitioners and those learning about security. This topic is going to rapidly get unmanageable, and will need reorganized and broken down into some categories. However, until I start filling in some valuable sites, I'm not sure how I'm going to break it down. Expect changes in the near future.

• Shodan web search engine - "Shodan is the world's first search engine for Internet-connected devices. Discover how Internet intelligence can help you make better decisions."
• Have I Been Pwned? - A site for checking whether your email or phone is in a data breach
• Vulnhub - A collection of intentionally vulnerable, downloadable virtual machines to practice your security skills
• Awesome Cybersecurity Blue Team - A GitHub page loaded with resources for blue team specialists.