Here are a few options for the description of the WordPress post tag “顏色學” (Color Theory) in Traditional Chinese, with varying focuses:

**Option 1 (Concise & Informative):**

> 關於色彩理解、配色、以及不同色彩心理學影響的學問。 (Guānyú sècǎi lǐjiě, pèi sè, yǐjí bùtóng sècǎi xīnlǐxué yǐngxiǎng de xuéwèn.)
> *Translation: The study of understanding colors, color matching, and the psychological effects of different colors.*

**Option 2 (Slightly more descriptive):**

> 探索色彩的科學與藝術，包括色彩的原理、視覺效果，以及如何運用色彩創造視覺上的和諧與魅力。 (Tànsuǒ sècǎi de kēxué yǔ yìshù, bāokuò sècǎi de yuánlǐ, shìjué xiàoguǒ, yǐjí rúhé yùnyòng sècǎi chuàngzào shìjué shàng de héxié yǔ mèilì.)
> *Translation: Exploring the science and art of color, including the principles of color, visual effects, and how to use color to create visual harmony and appeal.*

**Option 3 (Focusing on practical application):**

> 學習色彩搭配技巧，了解色彩對不同設計風格的影響，以及如何在設計、藝術、時尚等領域中靈活運用色彩知識。 (Xuéxí sècǎi dāpèi jìqiǎo, liǎojiě sècǎi duì bùtóng shèjì fēnggé de yǐngxiǎng, yǐjí rúhé zài shèjì, yìshù, shìshàng děng lǐngyù zhōng línghuó yùnyòng sècǎi zhīshi.)
> *Translation: Learn color matching techniques, understand the impact of color on different design styles, and how to flexibly apply color knowledge in fields like design, art, and fashion.*

**Option 4 (More general and inviting):**

> 深入探索色彩世界的奧秘，揭示色彩背後的知識與藝術價值。 (Shēnrù tànsuǒ sècǎi shìjiè de àomì, jiēshì sècǎi bèihòu de zhīshi yǔ yìshù jiàzhí.)
> *Translation: Explore the mysteries of the world of color in depth, revealing the knowledge and artistic value behind color.*

**Which one to choose?**

* **Consider your target audience:** Who are you writing for? Beginners? Designers? Artists?
* **Consider the general tone of your blog/website:** Is it formal or casual?
* **Consider the focus of the posts tagged with this term:** What topics will be covered?

Choose the description that best reflects the content you’ll be writing about. You can also adjust these options to fit your needs! Good luck!