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System.out.println("Welcome to learncs.online!");
System.out.print("We are ");
for (int i = 0; i < 4; i++) {
System.out.print("so ");
System.out.println("excited to start your journey in computer science!");

Learn Computer Science Online

  • 61 focused lessons—from "Hello, world" to graph recursion
  • Learn Java or Kotlin
  • 902 editable and runnable code examples
  • 2,511 interactive explanations from 264 instructors, including 173 hours of live coding walkthroughs
  • 132 programming problems covering all core language features
  • 384,583 debugging challenges that train you to fix small mistakes
  • A community of learners to reach out to for support
  • One goal: Teaching you about computer science and programming!

We'll teach you the basics of computer science and programming. Once you know these things, you can and will change the world.

Ready to go? Start here.