The stats tab on the right hand panel gives you a overview of your data.

How to Get to Stats Tab

To get to the Stats tab, simply select the lightbulb icon on the right hand side of your sheet.

What is included on the Stats Tab

Overview: Includes file name, size, # of rows/columns, and a summarized description

Data By Type: This is a summary of the data by "Data Types". For more information on Data Types, please visit here. This can be either viewed as a table or chart. 

Column Summary: Summerizes each column's empty cells, unique count, and Data Type