📄️ 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.