owasp.org
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OWASP is a nonprofit organization that provides free, open resources to improve software and IoT security. The site hosts community-driven projects and documents—including the OWASP Top Ten, testing guides, cheat sheets, security tools, and dedicated IoT security resources.
More resources on IoT Security
IoT Security Foundation
Free resources, best practices, and practitioner guides
OWASP IoT Top 10
Essential checklist for IoT security risks
IoT Security - Black Hat 2018
Deep dive into IoT vulnerabilities by Jabra Speak hack
iotsecurityfoundation.org
IoT Security Foundation is a nonprofit organization that provides practical, vendor-neutral guidance to improve security for IoT devices and deployments. The site offers security best practices, white papers, training resources, and information on standards, certifications, and events for developers, manufacturers, and operators.
Practical IoT Security
Practical IoT Security - A book resource
iotworldtoday.com
IoT World Today is a news and analysis site for the Internet of Things, with in-depth coverage of IoT security, connectivity, platforms, and deployments. It offers articles, expert insights, and case studies on real-world IoT implementations and security best practices.