Learn ethical hacking, vulnerability assessment, and pen testing with Nmap, Nessus, and OpenVAS. Plus, master pentest reports and security audits with top courses.

Google offers many online courses with free certificates and badges. We’ve put together a full list.

TL;DR Duolingo reported Q4 2025 revenue of $282.9 million (+35% YoY), closing its first billion-dollar year, breaking estimates again. The stock dropped 22.5% anyway. Again. The company plans to slow down monetization to grow to 100 million DAUs until 2028, by focusing on teaching quality, giving more to free users, and growing non-language courses. Duolingo’s Q4 2025 results confirmed something we highlighted in its 2025 review: growth is slowing. The company crossed a billion dollars in r

In October, Class Central wrote about CreativeLive shutting down on December 31, 2025. That article led to a series of events that actually saved the platform. Just two weeks before the deadline, on December 15, CourseHorse, an online marketplace of live classes, workshops, and experiences, acquired it for an undisclosed amount. The website is no longer closing at the end of the year. In 2021, Fiverr acquired it for $11 million. Four years later, in May 2025, the platform stopped accepting new