Our method is based on the work of the American linguist Stephen Krashen. Krashen's theory is that we acquire new languages naturally through comprehensible input.
Anything that you consume in your target language Krashen calls input: A German text, a podcast or a conversation with a native speaker are all input. Input is comprehensible, when you can understand its meaning - when you can comprehend it.
This is effectively also how children learn their first language. At first, they can only understand a few basic words. Gradually, new words are being added, and sentences become more and more complex.