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. Five courses, 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.
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 five 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, and scientific thinking, ending with how to study with AI.
Start with writing reports, summaries and persuasive pieces, move on to reading numbers and data and short English emails, then prompting, fact-checking and splitting work with AI.
First understand what AI is and how it produces answers, then learn to write prompts, check the results and use AI responsibly 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 50 lessons cover Korean, English, math, basic science and AI in five courses of ten. Clear writing, reading English sources, weighing numbers and evidence, and knowing how AI produces answers 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. Marking a lesson complete saves your progress only in this browser. The math, science and AI 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 three of the five courses. Math Basics, Basic Science and AI Basics are fully in English, including quizzes and the unlimited math drills. 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.
These lessons summarise general school-level knowledge for self-study and do not replace exam materials or professional advice.