Quick Insights is a way to summarize data quickly to gain insights.  It uses the approaches available in Insight, but makes them available directly from the dataset in Data Manager.  After selecting a dataset in Data Manager, select the Quick Insights option from the Selected Dataset menu or the right click menu:

You can select any of the available Insight types, such as Chart, Table, or Pivot.

After selection, you will be provided with options similar to those provided in the Insight area of LityxIQ.  See https://support.lityxiq.com/184255-Viewing-Available-Insights as a starting point for more information on creating insights with a dataset.  If you like the insight you generated with using Quick Insights, you can save it into an Insight Library using the Save As Insight button.  You will be asked to enter a name, description, and which library to place it.