How big a brush does a novice use to complete the video course of calligraphy brush teaching?

There are many kinds of writing brushes, and the nib is made of animal hair. Therefore, people often classify pens according to their different elasticity. Generally divided into hard brush, soft brush and double-sided brush. For beginners, if you use a hard brush from the beginning, it will be easier to pick up the pen without much skill, because the pen will help you a lot, but over time, you can only use the hard brush. Once you pick up the sheep's hair, you will feel unable to move. On the contrary, if you practice calligraphy with sheep's hair when you are a beginner, although it is difficult at first, you must change the front by lifting and pressing to write qualified strokes, but you also learn the method of using soft pen. With the increase of contact time, you will gradually become handy and use it freely. At this time, if you pick up a hard brush to write, you will feel relaxed. The ancients also had a lot of experience in the use of pens. I don't think it is easy to buy a good and expensive pen when I am a beginner, but I advocate using a bad pen, because if you can write good words with a bad pen, you will be more comfortable and write better with a good pen. On the contrary, if you start with a good pen, you will only use a good pen all your life. Once you encounter a poor pen, you will not be able to write well. Of course, you can't practice calligraphy with a rotten pen, which will make it more difficult for beginners. Ou Yangxun, a great calligrapher in the early Tang Dynasty, recorded that "if you don't choose paper or pen, you will achieve your goal", which was praised by Yu Shinan of the same age. In addition, from the economic point of view, the authentic wolf brush is very expensive, the good "big orchid bamboo" costs one or two hundred yuan, the ordinary sheep brush only costs two or three yuan, and a little better five or six yuan is enough. And because the pen is hard and easy to wear, it is not smooth when used, while the pen is soft and durable. It is economical for beginners to buy a wool pen. Before buying a pen, you should also know the model of the brush. Brushes are divided into small letters, medium letters and large characters due to different styles, and the biggest ones are screen pens, couplet pens, bucket pens and planting pens. Because the name and brand of each pen factory are different, its size is also different. Beginners can buy a pen with a long front end, about four or five centimeters in length and about one centimeter in diameter. Such a brush can write in block letters 7 cm square. More suitable for people who have just learned calligraphy.