Refold method, probably. The decks are pay-what-you-want. It was developed by language learning junkies: they stole the main, widely-accepted strategies for lea

Refold method, probably. The decks are pay-what-you-want. It was developed by language learning junkies: they stole the main, widely-accepted strategies for learning a new language as quickly as possible from language learning forums, then formalized it and kinda productized the thing. The gist is that the past decade or two they figured out that you learn a language fastest by focusing 100% on comprehension for your first 6 months or so, and only starting to read and write after your comprehension crosses a certain threshold. You basically race up to the point where you can understand ~70% of a TV show, then from there, learning to read and write is easy.