Filtering Rows and Selecting Columns (The Right Way)

A Pandas tutorial shows how to select rows and columns with both position-based `iloc` and label-based `loc`.

It highlights that `loc` uses labels and includes the end of a slice, while `iloc` works by row position.

After filtering a DataFrame, index labels may no longer match row positions, so `iloc`/`loc` assumptions can break.

Using the right selector makes filtering, column extraction, and slicing more accurate and easier to read.