A Studying System for people who build things.

Short, hands-on lessons. One idea at a time, instant feedback, nothing to install.

Free tools

Flashcard
Make your own cards, flip them to check yourself, and shuffle to mix things up. Saved in your browser.
Lucky Wheel
Type a list of names or ideas, one per line, and spin the wheel to pick one at random.
Free Board
A free canvas of sticky cards. Add, drag and colour them, or start from a ready-made template.

01
Backend Kotlin
Core Kotlin first, then Spring Boot, databases and Kafka. Tiny exercises, one idea at a time.
```
fun main() {
    val topic = "Kotlin"
    println("Hello, $topic!")
}
```
13 chapters · 148 lessons
Start
02
React
Components, state and effects. Build it, break it, fix it.
10 chapters · 63 lessons
Start
03
JavaScript
Variables to async code, then TypeScript. Predict it, then write and run real code.
10 chapters · 55 lessons
Start
04
Python
From your first variable to classes and files. Write real code and run it in your browser.
13 chapters · 69 lessons
Start
05
DSA
Arrays to graphs. Watch every algorithm move step by step.
10 chapters · 45 lessons
Start
06
DevOps
Ship it, watch it, fix it at 3am. Pipelines, containers and monitoring.
Coming soon