Here are a few description options for a WordPress post tag titled “訓練” in Traditional Chinese, ranging in nuance and formality:

**Option 1: Simple & Direct (Good for general use)**

> 各種用於提升技能、知識或體能的訓練活動。涵蓋學習、練習、操練等多種形式。
>
> Translation: Various training activities used to improve skills, knowledge, or physical fitness. Includes various forms such as learning, practice, and drill.

**Option 2: Emphasizing Development (Focuses on the outcome)**

> 透過有系統的訓練，不斷完善自我，達到提升能力與精進表現的過程。
>
> Translation: The process of continuously improving oneself through systematic training, achieving the goals of enhancing abilities and perfecting performance.

**Option 3: Action-Oriented (More suitable for posts about action or specific exercises)**

> 關於訓練方法、技巧、以及實際操作的分享。分享如何有效進行訓練，提升效率。
>
> Translation: Sharing about training methods, techniques, and practical execution. Sharing how to effectively conduct training to improve efficiency.

**Option 4: Broad and Inclusive (Provides more context, may be good for the “Training” category)**

> 涵蓋各種形式的訓練，包括體能訓練、技能訓練、心靈訓練等。目的是達到目標、改進表現、增強能力或培養新的習慣。
>
> Translation: Encompassing various forms of training, including physical training, skill training, mental training, etc. The purpose is to achieve goals, improve performance, enhance abilities, or cultivate new habits.

**Option 5: Shorter and more SEO-friendly (If you want it to rank well in searches)**

> 訓練 | 技能提升 | 學習 | 練習 | 實踐
>
> Translation: Training | Skill Improvement | Learning | Practice | Implementation

**Choosing the Best Option:**

* Consider the *content* of the posts the tag will be used for.
* Think about your *target audience* and their level of understanding.
* If you want the tag to be an umbrella term, the broadest description (Option 4) is best.
* If your website is action-oriented, use Option 3.
* For general usage, Option 1.

Remember to adjust the descriptions based on the specific subject matter covered by your website.