The more AI can do for us, the more our own foundations matter: the language skills to turn thoughts into precise sentences, English to reach a wider world of sources, math and science to weigh numbers and evidence, and an understanding of how AI produces its answers.
With these basics, one well-made prompt lets you work with AI clearly and turn what it gives you into creative, productive work. Seven courses, including money and the economy and reading and writing simple code, taken one lesson at a time.
Courses marked "In Korean" are written for native Korean speakers and are available in Korean only.
Ten lessons each. Taken in order, every lesson builds on the one before.
AI can do the arithmetic for you, but deciding what to calculate and judging whether the answer is right is still your job. This course rebuilds the math you need for that judgment.
Before science is a list of facts to memorize, it is a way of checking claims. Once you know the basic principles, you can judge for yourself whether an AI's explanation is right.
To use AI well, you first need to know what it does well and what it does poorly. Once you understand how it works, your questions change, and when your questions change, so do the results.
Financial literacy is not knowing what to buy. It is the ability to run the numbers yourself and test whether a claim adds up. The more financial information AI pours out, the more these basics become your yardstick for judgment.
Coding is not just a skill for developers. It is a basic literacy that lets you hand repetitive work to a computer and check whether code an AI wrote for you is actually right. You learn by running code yourself in the browser, with nothing to install.
Sentence structure, spelling and spacing, paragraphs, summaries, reading for evidence, logical writing, revision and clear prompts.
Sentence patterns, tenses, modals, relative clauses, prepositions, vocabulary, reading strategies, short emails and prompting in English.
Lessons picked from all seven courses and put in order for three kinds of learners. Work down the list and each lesson sets up the next.
Lock in the core of calculation (fractions, percentages, equations, functions), then sentence structure and reading, English patterns and tenses, scientific thinking and a first taste of code (values, variables, conditions), ending with how to study with AI.
Start with writing reports, summaries and persuasive pieces, move on to reading numbers and data, short English emails, money math (compounding, loans, tax) and spotting scams, then prompting, fact-checking, splitting work with AI, automating small spreadsheet and text chores, and checking AI-written code.
First understand what AI is and how it produces answers, then learn to write prompts, check the results, use AI responsibly and check the code it writes before bringing it into work and study.
Starting from the top works best, but if you have a pressing goal, begin here.
Foundational literacy is the skill that lasts longest in the AI era. These 70 lessons cover Korean, English, math, basic science, AI, economics and personal finance, and coding in seven courses of ten. Clear writing, reading English sources, weighing numbers and evidence, knowing how AI produces answers and how money works, and being able to read and write simple code let you talk to AI precisely and turn the results into creative, productive work.
Every lesson runs: goals, explanation with worked examples, key points, practice questions, and prompt ideas for reviewing with AI. Answers and explanations can be expanded, and multiple-choice questions can be checked instantly. Coding lessons also have a code lab: edit the code, run it and it is checked automatically, inside an isolated sandbox in your browser. Marking a lesson complete saves your progress only in this browser. The math, science, AI, economics and coding courses are fully in English; the Korean and English courses are taught in Korean.
Yes. All lessons and questions are free with no sign-up, and progress is stored in your browser without an account.
Yes for five of the seven courses. Math Basics, Basic Science, AI Basics, Economics and Personal Finance Basics and Coding Basics are fully in English, including quizzes, the unlimited drills and the code labs. Korean Language Basics and English Basics are written for native Korean speakers and are available in Korean only.
Any course can come first, but within a course start at lesson 1. If you have a specific goal, use 'Where should I start?' on the home page.
No. Coding Basics starts from what a program is, and every lesson has a code lab where you edit and run JavaScript right on the page. Your code never leaves your browser: it runs in an isolated sandbox with no network access and is stopped after 2 seconds.
These lessons summarise general school-level knowledge for self-study and do not replace exam materials or professional advice. The economics and finance lessons recommend no products and are not investment or tax advice. All sample data in the coding lessons is made up.