Here are a few options for a WordPress post tag description in Traditional Chinese, each with a slightly different focus:

**Option 1 (General & Descriptive):**

> 身分證影本相關內容，包含用途、注意事項、以及常見問題解答。  了解影本的重要性，以及如何安全地處理和保護您的身分證影本。

* **Translation:** Content related to copies of ID cards, including their uses, important notes, and answers to frequently asked questions. Understand the importance of copies and how to safely handle and protect your ID card copies.
* **Focus:** Comprehensive and educational.

**Option 2 (Focus on Security):**

> 身分證影本安全須知： 了解如何保護您的身分證資訊，避免被盜用，以及如何安全地使用和存放影本。  為保障您的個資安全，請務必仔細閱讀。

* **Translation:** ID Card Copy Security Notice: Learn how to protect your ID card information, prevent its misuse, and how to safely use and store copies. Please read carefully to safeguard your personal information security.
* **Focus:** Emphasizes security concerns.

**Option 3 (Short & Concise):**

> 關於身分證影本的一切： 相關資訊、指南和常見問題。

* **Translation:** Everything about ID card copies: Related information, guides, and frequently asked questions.
* **Focus:** Brief and to the point.

**Option 4 (Focus on Usage):**

> 身分證影本的用途與必要性，包括申請文件、辦理手續等。   更多關於如何正確使用和提交身分證影本的指南。

* **Translation:** The uses and necessity of ID card copies, including applying for documents and completing procedures. More guidance on how to correctly use and submit ID card copies.
* **Focus:** Addresses common uses.

**Choosing the Best Option:**

* **Consider the content of your posts:** The description should align with the type of information you are posting.
* **Think about your target audience:** Are they looking for detailed guidance or a quick overview?
* **Keep it concise:** While you want to be informative, a shorter description is easier to scan.
* **SEO Consideration:** Choose a description that might draw search traffic – if people are searching for it, include relevant keywords like “身份證資訊” (ID card information) or “個資安全” (personal information safety).

I recommend starting with Option 1 or Option 2, using whichever aligns best with the theme and purpose. Make sure to also use it when you are tagging your posts.