Can I just use a brush when I am a beginner in Chinese painting? . . .

First of all, the teacher must have taught you how to use a pen. If used improperly, you may not remember the essentials. You must use the brush according to the method. There are two kinds of Chinese paintings: freehand brushwork and meticulous brushwork, and the choice of pens is also different. It is recommended to choose high-quality brushes. After all, the quintessence of Chinese culture can't be done casually, and it needs good basic equipment. Good luck with your adoption! ~