By default, Power BI Q&A suggests some questions about your data. However, you can customize them as per your requirements. I mean, you can place your own set of questions based on your requirements. Let me show you how to Customize Power BI Q&A Suggestions with a practical example.
TIP: I suggest you refer the Q&A Introduction article in Power BI to under the introduction part.
For this Customizing Power BI Q&A Suggestions demonstration, we are using the third Dashboard. From the below screenshot, you can see the list of Q&A suggestions generated by Power BI

How to Customize Power BI Q&A Suggestions
Within the Left Navigation pane, Go to the Third dashboard under the My Workspace, and click on the … button. Next, select the settings from the context menu.

Selecting the settings option opens the following window.

Go to the Datasets tab, and select the dataset that you want. Next, expand the Featured Q&A Questions section.
Add questions under this section is used to add your custom questions on this dataset.

Once you click that Add a Question link, it provides a text box to write your own question.

For the Customize Power BI Q&A Suggestions demo purpose, we added one question. Once you were complete, click the Apply button

Let me add another question too.

Now, when you open the Third dashboard Q&A, you can see those two questions that we added earlier. Let me select average sale

You can see, it is displaying a Card with an Average annual sale
