The headquarters of Dana Technology is in Beijing, and the headquarters of Dana Technology is not necessarily the best, because Dana is a distance video teaching, and the video content of each campus should be the same. Mainly depends on the degree of personal study effort. However, I personally prefer the face-to-face teaching mode. I asked my brother to go to Huaxia Boda, where experts taught face to face, so that I could ask questions in time if I didn't understand anything. I think it would be better.