Learn Toki Pona, all 120ish words of it

Toki Pona has about 120 words. That's the whole language, on purpose: Sonja Lang built it in 2001 to see how much you can say with how little. Because there's so little to memorize, the interesting part starts immediately, combining small words into bigger meanings, which is the skill every other language is secretly about.

People reach conversational Toki Pona in weeks, not years. Parlita gets you talking from the first session, and there's no better way to feel the whole arc of learning a language, compressed into a month. toki! is hello. You're already 1% done.