Looking for the best course to learn data structures and algorithms? I’ve compiled the best DSA courses to become a better coder or prepare for interviews.

Here is a guide with the best free online courses to learn Haskell for both beginners and experienced programmers.

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

Source: Udemy Investors page The merger is complete. That too, months before its second-half 2026 target. After three failed attempts and five months of regulatory and shareholder review, Coursera and Udemy have finally combined. Now comes the restructuring, the platform integration, and some unanswered leadership questions. The all-stock deal was first announced on December 17, 2025, and approved by stockholders on April 9, 2026. Each Udemy share was exchanged for 0.8 shares of Coursera. Udemy