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Learn to code.In every language.

Interactive tutorials in Go, Python, JavaScript, Java, Rust, and C++. Write real code in your browser, get instant feedback, and ace technical interviews.

✓Write real code in your browser — zero setup
✓Instant pass/fail feedback on every step
✓Same concepts taught across all 6 languages
✓Built-in LeetCode-style interview practice

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6

Languages

0

Lessons (Go)

11+

Problems

Free

to start

✓Step passed! +10 XP

🔥3-day streak

hello.go

Step 1 / 5Getting Started

Use fmt.Println() to print "Hello, World!" to the console.

1package main

2.

3import "fmt"

4.

5func main() {

6 fmt.Println("Hello, World!")

7}

Output

Hello, World!✓Correct!

See how it works

How it works

Four steps. Zero setup. Real code.

01

📖

Read

Short, focused lessons with clear explanations and real examples.

02

✏️

Code

Edit real code directly in your browser — no installs, no setup.

03

✓

Check

Instant feedback tells you if your output matches the expected result.

04

🏆

Level up

Earn XP, maintain streaks, and track your progress across all languages.

Pick your language

Same concepts, same structure — start in seconds with no setup.

Go

Learn Go programming for free with uByte. Interactive Golang tutorials for beginners — write and run real Go code in your browser. Start today.

Start learning→

Python

Learn Python programming for free with uByte. Interactive Python tutorials for beginners — write and run real Python code in your browser.

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C++

Learn C++ programming for free with uByte. Interactive C++ tutorials for beginners — write and run real C++ code in your browser.

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JavaScript

Learn JavaScript programming for free with uByte. Interactive JS tutorials for beginners — write and run real code in your browser.

Start learning→

Java

Learn Java programming for free with uByte. Interactive Java tutorials for beginners — write and run real code in your browser.

Start learning→

Rust

Learn Rust programming for free with uByte. Interactive Rust tutorials for beginners — write and run real code in your browser.

Start learning→

🎯

Ace your interview

LeetCode-style

Solve classic problems — Two Sum, LRU Cache, Merge Intervals and more — in any language. Same IDE, built right in.

Two Sumeasy
Three Summedium
Maximum Subarraymedium
Trapping Rain Waterhard
Valid Parentheseseasy
Climbing Stairseasy
+ 5 more problems

Browse all problems

Go

Arrays, hashmaps & goroutines

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Python

Clean syntax, fast prototyping

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C++

Pointers, STL & performance

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JavaScript

Closures, callbacks & async

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Java

OOP, generics & collections

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Rust

Ownership, lifetimes & safety

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📋

Practice exams

Pro

Timed multiple-choice exams by language. 160 questions, 60 minutes. Score at least 70% to pass and earn a certificate.

View practice exams

Go

60 min · 70% to pass · Certificate

Python

60 min · 70% to pass · Certificate

C++

60 min · 70% to pass · Certificate

JavaScript

60 min · 70% to pass · Certificate

Java

60 min · 70% to pass · Certificate

Rust

60 min · 70% to pass · Certificate