Here are a few options for the description of a WordPress post tag titled “線上視訊” (Online Video) in Traditional Chinese, ranging in detail and focus:

**Option 1: Concise and Direct**

> 用於標記與線上視訊相關的文章。涵蓋直播、會議、教學影片等。
>
> *(Used to tag articles related to online video. Covers live streaming, meetings, instructional videos, etc.)*

**Option 2: Slightly More Descriptive**

> 搜尋有關線上視訊的資訊。包含各種視訊平台、網路會議、線上課程、影片內容分享等。
>
> *(Search for information about online video. Includes various video platforms, online meetings, online courses, video content sharing, etc.)*

**Option 3: Focus on User Benefit**

> 找到方便易用的線上視訊工具與教學。探索如何進行線上會議、直播活動，以及錄製與分享影片。
>
> *(Find easy-to-use online video tools and instructions. Explore how to conduct online meetings, live streaming events, and record and share videos.)*

**Option 4: Emphasizing the Scope**

> 標記所有關於線上視訊的文章，涵蓋直播串流、視訊會議、線上教學、影音製作、影片平台、相關軟體與硬體等。
>
> *(Tag all articles about online video, covering live streaming, video conferencing, online teaching, video production, video platforms, related software and hardware, etc.)*

**Option 5: Short and Sweet (Best for limited space)**

> 線上視訊相關資訊。
>
> *(Online video related information.)*

**Key Considerations and Recommendations:**

* **Relevance:** The description should accurately reflect the content tagged with “線上視訊”.
* **Search Engine Optimization (SEO):** Include keywords like “直播 (live streaming)”, “視訊會議 (video conferencing)”, “線上教學 (online teaching)”, and “影片 (video)” to help with search results within your site and on search engines.
* **Target Audience:** Tailor the language to your target audience. Are they beginners, experts, or a mix?
* **Brevity:** In most cases, shorter descriptions are preferred, especially if space is limited.
* **Clarity:** Make it easy for users to understand what kind of information the tag encompasses.

**I recommend choosing Option 1, 2, or 3 depending on the level of detail you want.** If you have limited space, Option 5 is adequate. Remember to adapt the description to best suit your website’s content!