Here are a few options for a WordPress post tag description for “發展心理學” (Traditional Chinese), ranging from concise to a bit more detailed, depending on your needs:

**Option 1: Concise & Clear**

* **Description:** 探討人類成長和生命歷程中的心理變化。 (Tàn tǎo rén lèi chéng zhǎng hé shēng mìng lì chéng zhōng de xin lǐ biàn huà.)
* **Translation:** Exploring psychological changes in human growth and life stages.

**Option 2: Slightly More Descriptive**

* **Description:** 發展心理學關注生命不同階段的心理、認知、情緒和社会發展。 (Fā zhǎn xin lǐ xué guān zhù shēng mìng bù tóng jiē duàn de xin lǐ, rèn zhī, qíng xù hē shè huì fā zhǎn.)
* **Translation:** Developmental psychology focuses on the psychological, cognitive, emotional, and social development at different stages of life.

**Option 3: Focused on Learning**

* **Description:** 關於人類發展歷程的心理學研究，幫助我們理解不同年齡段的思維、行為和情感。 了解更多關於學習、成長和發展。 (Guān yú rén lèi fā zhǎn lì chéng de xin lǐ xué yán jiū, bāng zhù wǒ men lǐ jiě bù tóng nián líng duàn de sī wéi, xíng wéi hé qíng gǎn. Liǎo jiě gèng duō guān yú xué xí, chéng zhǎng hé fā zhǎn.)
* **Translation:** Psychological research on human development, helping us understand thinking, behavior, and emotions at different ages. Learn more about learning, growth, and development.

**Option 4: Including Keywords**

* **Description:** 探索發展心理學，研究從嬰兒期到老年期的心理變化。涵蓋兒童發展、青少年發展、成年發展和老年發展等領域。 (Tàn suǒ fā zhǎn xin lǐ xué, yán jiū cóng yīng ér qí dào lǎo nián qí de xin lǐ biàn huà. Hán gài ér tóng fā zhǎn, qīng shào nián fā zhǎn, chéng nián fā zhǎn hé lǎo nián fā zhǎn děng lǐng yù.)
* **Translation:** Explore developmental psychology, studying psychological changes from infancy to old age. Encompassing areas such as child development, adolescent development, adult development, and aging.

**Tips for Choosing the Best Option:**

* **Consider your audience:** Who are you writing for? A general audience might benefit from a more explanatory description. If it’s for academics or students, precision could be prioritized.
* **Keywords:** Make sure the description includes relevant keywords that people are likely to search for (e.g., 兒童發展 – child development, 青少年發展 – adolescent development, 老年發展 – aging).
* **Character Limit:** WordPress has a limit on how long the description can be.
* **SEO:** While WordPress does not primarily use descriptions to identify keywords anymore, it is still good practice to include keywords associated with the topic.

**How to Add the Description in WordPress:**

1. **Go to Posts > Tags** in your WordPress admin dashboard.
2. **Find the “發展心理學” tag.**
3. **Click “Edit”.**
4. **Look for the “Description” field** (it’s usually right below the Tag name).
5. **Paste your chosen description into the field.**
6. **Click “Update”.**

I recommend using Option 2 or 4, as they offer a good balance of clarity and information, especially if you are trying to attract a broad audience. Choose what feels best for your website!