Here are a few options for the description of the “備忘錄” post tag in Traditional Chinese, ranging in formality and emphasis:

**Option 1 (Simple & Direct):**

> 用於分類記錄重要事項、提醒、筆記，方便日後查閱。

* **Translation:** Used to categorize important matters, reminders, and notes for easy future reference.

**Option 2 (Slightly More Explanatory):**

> 包含快速記錄、隨筆、待辦事項、個人想法等等，幫助整理思緒、避免遺忘的重要標籤。

* **Translation:** Includes quick notes, random thoughts, to-do lists, personal ideas, and so on; a helpful tag for organizing thoughts and preventing forgetfulness.

**Option 3 (Emphasis on Personal Use):**

> 屬於個人的備忘錄，記錄生活點滴、工作要點，以供日後參考。 方便自己尋找所需資訊。

* **Translation:** Belonging to a personal memo, recording snippets of life, key points of work, for future reference. Convenient for finding the information you need.

**Option 4 (Concise & Modern):**

> 備忘錄：重要的記錄和提醒，快速方便的資訊查找。

* **Translation:** Memo: Important records and reminders, for quick and convenient information retrieval.

**Which to choose?**

* Consider your blog’s overall tone and the audience.
* If you’re aiming for simplicity, option 1 or 4 are good.
* Option 2 offers a bit more detail.
* Option 3 is suitable for a personal blog.

Feel free to tweak any of these to best suit your needs! Just remember that you’re describing the purpose of the “備忘錄” tag within the context of your WordPress blog.