Pivot - Pivot vs Pivot Table Best to Practice, for example I used with S&P 500 data to see how it has performed over months as the x axis.
Stack and Unstack-
- Stack moves a column to row, unstack does the opposite:
- unstack()
Groupby()- groupby() generally it splits data
Multi-Index- I think the best way to learn this is to watch a YouTube video or get examples.
lost? ~ Index - Data Engineering