11.What is Reindexing in Pandas?
12. How to Select a Single Column of a Data Frame?
13. How to Rename a Column in a Data Frame?
14. How to add an Index, Row, or Column to an Existing Data frame?
15. How to Delete an Index, Row, or Column from an Existing Data Frame?
16. How to set the Index in a Panda data Frame?
17. How to Reset the Index of a Data Frame?
18. How to Find the Correlation Using Pandas?
19. How to Iterate over Data frame in Pandas?
20.What is the difference between series and Dataframe?