Series and DataFrames
The two pandas structures — a labelled 1-D Series and a 2-D DataFrame — and how the index changes everything.
Loading and Saving Data
read_csv, read_excel and read_json; writing back out; and why index=False matters.
Inspecting Data
head, tail, shape, dtypes, info and describe — the first six things to run on any new DataFrame.
Cleaning Data
Filling and dropping missing values, removing duplicates, and converting types back after the fix.
Selecting and Transforming
Column selection, loc vs iloc, filtering, sorting, adding columns, groupby, merge and concat.