1. When choosing a teapot, think about its resale value; traditional shapes are more popular (e.g., Shi Piao, Xi Shi, Qin Quan, Fang Gu, etc.).

2. Judge the craftsmanship by the lid and the elegance by the spout; proportions should be harmonious and aesthetically pleasing.

3. Regardless of the maker's title, evaluate the teapot itself (the quality of the clay and craftsmanship matters most). A high title means nothing if the teapot is poorly made. Of course, a well-crafted teapot with excellent clay and a high title is ideal.

4. Whether old or new, every era has its masterpieces and ordinary pieces. Assess value based on clay, shape, and craftsmanship, not just the maker's mark, as fake antiques are rampant.

5. Principles for evaluating a teapot: 1. Clay, 2. Shape, 3. Craftsmanship, 4. Inscription, 5. Function, 6. Aura, 7. Spirit, 8. Charm.

6. The knowledge about purple clay teapots online or in forums is limited and often includes misinformation (e.g., the 'tofu method' for opening a teapot, which I strongly disagree with). To learn properly, consult authoritative books and media to avoid pitfalls.

7. Even for teapots made by the same artisan with the same clay, prices can vary significantly based on craftsmanship.

8. The highest quality clay exhibits transformative colors; the pinnacle for enthusiasts is nurturing both the teapot and their well-being. The teapot reflects the person.

9. Study professional books and images of fine teapots to internalize the 'standard shapes,' aiding confident selection.

10. Combine theory with practice by patiently brewing and observing the teapot's evolving charm. Visit Yixing, the origin of purple clay, to form your own opinions.

Final note: A purple clay teapot's value lies in its quality and the joy it brings to the owner.