Here are a few description options for the WordPress post tag “信函” (Traditional Chinese) depending on the intended purpose and audience of your blog:

**Option 1: General & Concise**

* **Description:** 各種信件或書信，涵蓋不同的主題與目的。 / Various letters and correspondence, covering different topics and purposes.

**Option 2: More Specific & Descriptive (if you often write about different kinds of letters)**

* **Description:** 包含商業信函、私人信件、求職信、感謝函等各式各樣的信函範例、撰寫技巧及相關資訊。/ Includes examples, writing techniques, and related information for various types of letters, such as business letters, personal letters, cover letters, thank-you letters, etc.

**Option 3: Target Audience Focused (if your blog helps people write letters)**

* **Description:** 學習撰寫精準、得體的信函，有效傳達您的想法，無論是職場溝通、社交往來，或正式文件，這裡都有實用建議。 / Learn to write precise and appropriate letters, effectively conveying your thoughts. Whether for workplace communication, social interaction, or formal documents, you’ll find practical advice here.

**Option 4: Focus on Content Variety**

* **Description:** 我們分享關於信函的各種想法、分析、範例和見解。/ We share various thoughts, analyses, examples, and insights about letters.

**Key Considerations when choosing:**

* **Blog purpose:** What is your blog *about*? What content do you usually cover using this tag?
* **Target audience:** Who are you writing for? Are they expecting professional advice, educational content, or something else?
* **Content focus:** What specific aspects of letters are you concentrating on (examples, writing tips, different types, history, etc.)?

I would choose Option 2 or Option 3 for educational content, Option 1 for general purposes, or Option 4 for content diversity. You can always customize and combine elements from these options to create the most fitting description for your blog. Remember to update this description as your blog’s content evolves.