Learn and practice
Learn where your network already is
Courses, roadmaps, tests and career paths that count toward your profile, so the time you spend learning is time people can see.
What is inside the library
Courses
Lessons you do, not lessons you watch
Each lesson mixes short explanations with quizzes, drag to order exercises, live code and animated simulations. Progress and XP are saved to your account.
Build
Full stack web development, mobile apps, Java and Spring Boot, Python, C++, Go, Rust, game development and more.
Data and AI
Machine learning, generative AI and LLMs, data science, data analysis, data engineering and databases in depth.
Systems and product
DevOps and cloud, cyber security, system design, blockchain, quantitative development and product management.
Prove it
Turn learning into evidence
Skill tests
Short domain tests that you can retake. Your best score sits on your profile and the answers never reach the browser.
Assessments
A Master Assessment and six practice tracks, with three attempts each, a server side timer and full screen exam rules.
Roadmaps and career paths
Eleven role based paths, from Full Stack Developer to Product Manager, that fill in automatically from your real results.
Certificates
Finish a course track and get a certificate that anyone can verify.
Classroom
A classroom for trainers and teams
Students and trainers get chat, shared resources, a calendar, assignments and grades in the same app, with roles for students, teachers and admins.
Chat and resources
Talk with your class and keep every file in one place.
Calendar and grades
Live sessions, deadlines, assignments and feedback.
Pick a course and finish your first lesson today
Your progress starts counting on your profile from the first quiz.
Create your free profileFree to join. Your profile stays private until you choose to share it.