CodeSignal – The Duolingo of Coding Practice

The Report by Class Central

Your source for the latest news and trends in online education.

  1. 600 Free Google Certifications

    Trending
Most common
Popular subjects

  1. Artificial Intelligence

    14,536 courses

  2. Communication Skills

    4,369 courses

  3. Machine Learning

    17,584 courses
Popular courses

  1. Gamification

    University of Pennsylvania

  2. The Science of Gastronomy

    The Hong Kong University of Science and Technology

  3. The Science of Everyday Thinking

    University of Queensland

Class Central

Class Central
  1. classcentral.com
  2. Browse Courses
  3. Search
  4. About Class Central
  1. News
  2. Analysis
  3. Best Courses
  4. Free Certificates
    1. Best Free Online Courses of All Time
    2. Most Popular Online Courses of All Time
    1. Featured Articles
    2. Online Learning Guides
  7. Student Voices
  8. All
Sanja Markovic Photo

Sanja Markovic

I am a classroom teacher and I really like working with children.

Most Recent

Browse our catalog

Discover thousands of free online courses from top universities around the world like MIT, Stanford, and Harvard.

Browse all subjects