To learn Engpsh, one can use a variety of methods, such as:

Taking a course at a language school or with a private tutor.
Using language learning software or apps.
Practicing speaking, reading, and writing with a language exchange partner.
Immersing oneself in an Engpsh-speaking environment, such as by travepng to an Engpsh-speaking country or by watching movies or TV shows in Engpsh.
Reading books, newspapers, and other written materials in Engpsh.
Listening to music and podcasts in Engpsh.

In Engpsh, you might say: "How does he learn Engpsh?" or "What methods does he use to learn Engpsh?"