1. Know the structure and principle of the pen: Before buying a pen, you need to know the basic structure and working principle of the pen, such as the nib, the pen holder and the ink system.

2. Choose a nib that suits you: There are many kinds of pens, such as round head, square head and oblique head. Different pen tips are suitable for different writing habits and uses. Beginners can choose a medium hardness pen tip, and after proficiency, they can try a harder pen tip.

3. Pay attention to the material of the pen holder: the pen holder is made of plastic, metal and wood. Different materials have different feel and weight. Generally speaking, metal pens are durable, but heavy; Plastic pens are light and easy to carry, but they are not durable enough.

4. Consider the ink system: the ink system is an important part of the pen, including the ink bottle, ink absorber, catheter and so on. Different brands of ink systems have different characteristics and prices, which need to be selected according to their own needs.

5. Refer to other people's comments and recommendations: Before buying a pen, you can check other people's comments and recommendations to understand the advantages and disadvantages of different brands and models, so as to make a more informed choice.