I mainly studied Yahweh's shorthand record at school. In fact, Yahweh's shorthand record is very simple. I think you can learn Yahweh shorthand recording course by purchasing it, and you don't have to spend too much money on training courses. Yahweh's shorthand recording is actually similar to pinyin, except that he can type compatible codes with both hands, which is very convenient and quick. I suggest you sell a book first and learn it yourself if you can understand it. If you can understand it, the training course is too expensive. If you don't understand books, there are some video teaching online, which you can refer to.