Massive list of free certificates and badges for developers in data science, software development, and more.

In 2027, Duolingo is shutting down Duolingo for Schools, its free classroom tool that helped teachers track student progress and assign lessons. Coursera did the same thing last year, ending free course audits. It seemed sudden, but the signs were there. Class Central tracked the Duolingo for Schools shutdown too. And this time, the signs were all across social media platforms. Why the Shutdown? Duolingo for Schools was launched in 2015. Within a week, more than 10,000 teachers and 25,000 stud

They’re offered by many platforms including Google, Meta, and X, and cover SEO, social media marketing, and more.

Learn Cyber Threat Intelligence (CTI), threat hunting, and MITRE ATT&CK framework to strengthen your defenses. Real-world APT case studies and understanding attacker TTPs used in modern cyber threats.