Here are a few options for a WordPress post_tag description for “購物平台” (Shopping Platform) in Traditional Chinese, ranging from simple to slightly more detailed:

**Option 1: Simple & Direct**

> 網上商店、線上購物的地方。 (Online stores, places for online shopping.)

**Option 2: Focus on User Experience**

> 輕鬆方便的購物體驗，探索各種商品的平台。 (Easy and convenient shopping experience, a platform to explore all kinds of products.)

**Option 3: Highlighting Variety**

> 匯集多樣商品的購物平台，滿足您的各種需求。 (A shopping platform that brings together various products to meet your diverse needs.)

**Option 4: Emphasizing Accessibility**

> 讓您隨時隨地購物的平台，提供豐富的選擇和優惠。 (A platform that allows you to shop anytime, anywhere, offering a wide selection and deals.)

**Choosing the Best Option:**

* **Consider the audience:** Who are you writing for? Are they tech-savvy or less familiar with online shopping?
* **Think about the content:** What kind of posts will be tagged with “購物平台”? Do you need to be more general or specific?
* **Keep it concise:** Good descriptions are brief and to the point.

I’d recommend using **Option 1 or Option 2** as a good starting point for most WordPress sites. You can always edit the description later!