May I suggest that you read about the fiduciary duties and then write a blog post about why YOU think the duties are important? That is where true learning comes into play and then in practice make sure that all are being honored. 

Here are links that gives you many answers to the same question:

1. https://www.activerain.com/questions/show/73028/why-are-the-fiduciary-duties-so-important-

2. https://activerain.com/questions/show/64736/in-your-opinion--what-is-the-most-important-fiduciary-duty--why-

3. https://www.activerain.com/questions/show/72875/in-your-opinion--what-is-the-most-important-fiduciary-duty--why-

4. https://activerain.com/questions/show/39955/in-your-opinion--what-is-the-most-important-fiduciary-duty--why---

5. https://activerain.com/questions/show/39955/in-your-opinion--what-is-the-most-important-fiduciary-duty--why---

6. https://activerain.com/questions/show/59920/in-your-opinion--what-is-the-most-important-fiduciary-duty--why-

Charlotte Wagner fiduciary duties are very important to have a good professional reputation and avoid future legal liability problems.

Real estate agents are fiduciaries. As such they have the duty to clients to provide the highest possible standard of care, place the client’s interests ahead of their own and to, in all ways, act in the client’s best interests.

Of course, there is no "most important" fiduciary duty. To say that some duties could possibly be less important than any other detracts from the concept of Fiduciary Duty.

Because...lol

They provide protection for buyer and seller

Without ethics, virtue or as we refer to it "integrity" deals can go South quickly and take people with them...the courts are back-logged proof