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Interactive programming courses
Published on Kodion today
Written and edited by the people who build the platform, not bulk generated. How the content is made
Inside a lesson
Kodion is built around one uncomfortable fact: you can follow an entire tutorial and still not be able to write the thing yourself. So every part of a lesson is designed to make you produce an answer.
Lessons are short explanations followed by something you have to answer: predict the output, fill in the missing token, or pick the right call. You cannot scroll past a concept without engaging with it.
Submissions are graded on the server the moment you send them, and the response tells you why the right answer is right. Getting one wrong costs you nothing except the ten seconds it takes to understand it.
The AI tutor opens inside the lesson with your current step as context. No pasting code into another tab, no explaining what you are working on before you can ask your question.
Concepts you have covered come back on a spaced-repetition schedule, resurfacing just before you would lose them. Every plan gets a finite daily review session, so it is a few minutes, not a backlog.
Each module ends in a quiz, and the next module stays locked until you clear it. The gate exists so you never build a new concept on one you only half-understood.
XP, levels, streaks, achievements and weekly leagues track the only thing that reliably produces programmers: showing up again tomorrow.
How it works
Four stages, in that order. Skipping any of them is why most people stall somewhere around week three.
Every lesson is a sequence of short explanations and exercises you complete right in the browser. There are no hour-long videos to sit through and no local setup to fight: you read a little, write a little, and keep moving. Concepts arrive in an order designed so each one rests on the last, which is the part scattered tutorials cannot give you.
You do not discover at the end of a chapter whether you understood it. Every exercise is checked the moment you answer, with feedback that explains the reasoning rather than stamping it right or wrong. When you are properly stuck, the tutor is one click away and already has your lesson context, so you get a hint instead of a solution and go back to solving it yourself.
Each career path ends in projects that deliberately withdraw support. The first is walked through step by step, the second gives you requirements and scaffolding, and the last hands you a brief and nothing else. That last one is the one that changes how you think, because there is no walkthrough to fall back on.
Learning something once is not the same as keeping it. Kodion schedules short review sessions using spaced repetition, bringing each concept back right before you would naturally forget it. A few minutes a day is what turns last month's lessons into knowledge you still have next year.
What you can learn
A path is an ordered stack of courses that takes you from the fundamentals to work you could show someone. You can also take any course on its own.
7 courses, 3 projects
Build responsive, interactive websites and web applications from scratch to full-stack.
10 courses, 3 projects
Go from Python fundamentals to building and shipping production AI applications. Learn LLMs, RAG, the OpenAI API, and build a complete AI portfolio.
7 courses, 3 projects
Go from Python fundamentals to transforming raw data into actionable business insights. Master data cleaning, EDA, visualization, business metrics, and A/B testing — everything needed for a Junior Data Analyst role.
10 courses, 3 projects
Go from Python fundamentals to building and deploying production REST APIs. Master FastAPI, PostgreSQL, authentication, Docker, CI/CD, and Linux — everything needed for a Junior Backend Engineer role.
Take these on their own, in any order.
Build
Each path finishes with projects that hand you less and less help. The point is to get to the last one, where nobody tells you how.
Build a personal portfolio site from scratch using HTML, CSS, and JavaScript, guided step by step.
Build a React application with scaffolding provided. You implement the logic and state management.
Design and build a complete web application — frontend, backend API, and database — with no walkthrough.
Build a complete multi-turn chatbot with streaming responses, session management, and a configurable persona. Full step-by-step guidance included.
Build an AI agent that uses tool calling to search multiple sources, synthesize findings, and produce cited research reports. Requirements, architectural hints, and milestone checkpoints provided.
Design and build your own AI-powered SaaS product from scratch. Define the problem, architect the solution, and ship a working prototype — no walkthrough provided.
Query a sales database, clean the data, and build a matplotlib dashboard — every step guided from raw CSV to polished chart.
Analyze an email A/B test — clean the data, compute conversion rates, run a significance test, and write an executive summary. Requirements and hints provided.
Choose a real dataset and deliver a complete analysis report with EDA, business metrics, visualizations, and insights. Open-ended — no walkthrough.
Build a FastAPI REST API with full guided steps — routes, Pydantic models, database CRUD, and automatic OpenAPI docs.
Build an authenticated API backed by PostgreSQL with SQLAlchemy, Alembic migrations, and JWT auth. Scaffolding and hints provided.
Design and build a multi-service backend system with Docker Compose, CI/CD pipeline, and cloud deployment. No walkthrough.
Straight answers
No countdown timers and no fake scarcity. The free plan is a real place to learn from, and the paid plan is what funds the platform.
$0, no card
$12.99 / month
Free preview lessons in every course are readable without an account, so you can judge the teaching before you hand over an email address.
Browse the catalogWhat we store, what we never sell, how billing works and how to get a refund are all written down in plain language rather than buried.
Read the privacy policyWrong lesson, broken payment, or a question about which path fits you. Support goes to a human who can actually change the content.
Get in touchWriting
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A step-by-step 2026 roadmap to learn Python from scratch: what to study, in what order, which projects to build, and how long it really takes.
Master the fundamentals of Python programming with practical examples. Learn variables, data types, loops, and functions to build a strong foundation.
Start with Python, which is free the whole way through, and decide whether the method works for you before you spend anything.
