Here are a few options for a WordPress post_tag description for “線上副業” (Online Side Hustle, in Traditional Chinese), with slightly different nuances:

**Option 1 (Concise & General):**

> 探索網路上的額外收入機會，學習如何在線上建立副業，增加個人收入。 包括各種適合在家工作的副業選擇。
>
> *Translation: Explore opportunities for additional income online. Learn how to build a side hustle online to increase personal income. Including various side hustle options suitable for working from home.*

* **Why it works:** Clear, direct, covers the key aspects.

**Option 2 (Focus on Learning & Resources):**

> 提供線上副業的學習資源、實作教學、以及案例分享。 讓你在網路世界中找到適合自己的副業，並開始賺取額外收入。
>
> *Translation: Providing learning resources, practical tutorials, and case studies for online side hustles. Help you find a suitable side hustle in the online world and start earning extra income.*

* **Why it works:** Highlights the educational aspect and suggests resources.

**Option 3 (Focus on Practicality & Goals):**

> 想增加收入？ 了解各種線上副業，如何開始、如何執行、以及如何最大化你的收益。 讓你利用閒暇時間，達成財務目標。
>
> *Translation: Want to increase your income? Learn about various online side hustles, how to start, how to execute, and how to maximize your earnings. Let you use your spare time to achieve your financial goals.*

* **Why it works:** Emphasizes practicality and ties into personal financial goals.

**Option 4 (Short and Sweet):**

> 線上副業，讓你增加收入、提升技能，開啟多元的收入來源。
>
> *Translation: Online side hustle, let you increase income, improve skills, and open up diverse sources of income.*

* **Why it works:** Concise and emphasizes the benefits.

**Which one to choose?**

Consider these factors when selecting the best description:

* **Your Website’s Focus:** What kind of content do you usually post about?
* **Target Audience:** Who are you trying to reach with this tag?
* **Keywords:** Make sure it includes relevant keywords that search engines will pick up.
* **Length:** WordPress allows a fair length, so generally longer is better to explain in more detail.

I recommend Option 1 or Option 3, depending on the overall tone of your website. Adjust slightly if needed so it sounds natural within your site’s context. Good luck!