First, it is not recommended for beginners to use pure wool brushes.
Maybe you have heard someone say before: you must use sheep hair when you learn calligraphy for the first time. Sheep's hair is soft and can be used to practice your brushwork. This view seems reasonable, but it is groundless. According to textual research, writing with wool became popular only after the Southern Song Dynasty. But it was widely used after the early Qing Dynasty.
Second, don't use a long brush.
If the long front brush is made of animal hair, the cost is extremely high. Before Qi Ming, when I visited Mr. Ye Keqin of Yantian Academy, I saw some of his best long-feng sheep brushes, which were about 6 cm long. The output of this long-front wool brush is very low, and sometimes it takes months or even more than a year to save enough wool for this brush. So do wolf hair and purple hair. If it is genuine, it must be more expensive as time goes by.
Third, try not to use nylon brushes.
When Qi Ming first learned calligraphy, he especially liked to use a brush with more nylon content, because he thought it was effective, flexible and easy to "control". Later, with my own level and understanding, I gradually began to dislike this kind of writing brush, and turned to double both writing brush, mainly a wool, or sheep and wolves, and felt that it was more handy to write.