Is it in school, formal course, software, etc.?
Well, I think those three methods have equal part in the practice of touch typing. It depends on an individual onto which way he/she is comfortable.
Community Moderator at Typesy
It depends on the opportunities that people have. Not everyone learns it in school, but it is a very important life skill to have. I would recommend finding a way that works for you and add it to your list of goals.
Alex (The Reimagined Classroom Teacher)