Stage 1 · Day 19
Understand your data
Don't plot yet. The moment a dataset lands, run a fixed checklist of basic questions — each a one-line pandas call that builds a clear picture.
Click a question — see the answer
df.shaperows891
×columns12
Sets your expectations before anything else.
Remember
describe() and corr() only touch numerical columns. And correlation is your first taste of feature selection — a column with ~0 correlation to the target carries no signal.