Understand the Math & Intuition behind Quant Finance and AI.

One illustrated mini lesson at a time.

Story-led, illustrated mini lessons that spark curiosity, bring clarity, and help you think for yourself.

For every beginner — at any age, from any background.

Start with mathematical foundations, connect one idea to the next, and practise asking why, making predictions, and explaining what you understand. Every question is welcome.

Explore topic roadmaps in Quant Finance, Machine Learning, AI, and Essential Calculus. The current free samples begin with sine and carry that idea into a football launch-angle challenge. The roadmaps also describe topics planned for future mini lessons.

Explore next

• Our approach and the story behind 21IFM
• Follow @21ifm on X
• Basics Mathematics: free mini lessons
• What does sine actually mean?
• Same kick. How far?
• Quant Finance mini lesson: Curves + wiggles
• AI mini lesson: Backpropagation with real numbers

Stories, illustrations, and interactive mini lessons. Ask a question.