2.2 How to run Cells in Notebook ?

Run a Single Cell

• Click inside the cell hit the “Run button” or press Ctrl + Enter to run the cell

• Use this when testing a specific step, debugging, or iterating on one piece of logic

Run All Cells

• Use the Run All button (double-triangle / play-all icon) in the toolbar

• Executes every cell from top to bottom in order

• Use this when you want to reproduce the full analysis from scratch, after restarting the kernel, or before sharing results

When to Use Each

Key Rule

Always ensure your notebook runs correctly top-to-bottom in order — this is what guarantees reproducibility. If you edit a cell in the middle, re-run all cells below it to confirm nothing downstream breaks.