The first reason is that the writing of regular script is more standardized and it is faster to practice! Many students who have practiced calligraphy have this experience. There is often no pressure in the process of writing regular script. This is because the strokes of regular script are relatively standard and the font is completely neat. They don't pay attention to shape. As long as you can write one by one according to the specifications, you will soon be able to get started. So calligraphy is to learn regular script first!
The second reason is that our usual hard pen writing is regular script, which is also widely used in life! It is precisely because the calligraphy style we usually learn is regular script that we learn regular script first. This is because we already know regular script very well, and we know it deeply enough. At this time, it is equivalent to reviewing, and there is no great learning pressure!
The third reason is that regular script is the simplest of all calligraphy styles. Only by learning regular script well can we master the skills and level of learning other calligraphy styles! Moreover, in the process of writing regular script, you can practice all kinds of normative details in calligraphy. Being familiar with regular script is equivalent to laying a good foundation. If you can't even lay a good foundation for learning calligraphy, it will be difficult to make greater progress!