… understand the methods how is not correct.
- … understand how native speakers …
- … understand the methods native speakers use to learn …
- … understand the methods by which native speakers learn …
Díky, Dane! Byly by možné i níže uvedené možnosti?
You need to understand the methods OF/FOR how native speakers learn to speak faster.
You need to understand the methods (that/in which) native speakers learn to speak faster.