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In the previous chapter, we completed the installation of Jupyter Notebook. After installation, let's start it immediately and see what this smart notebook looks like. ### 1. Starting Jupyter Notebook First, in the command line, switch to the directory where you want to store your future notebook project files. For example, you want to work in the `my_jupyter` folder on your desktop: # Windows Example cd C:\Users\YourUsername\Desktop\my_jupyter # macOS/Linux Example cd ~/Desktop/my_jupyter Then, enter the startup command: jupyter notebook After pressing Enter, two things will happen: The command line window will start running a server (do not close this window). !(https://example.com/wp-content/uploads/2026/01/f79223e4-9cb5-43da-b132-6376e5c2d67f.png) Your default web browser (like Chrome, Firefox) will automatically open a new page, usually at the address `http://localhost:8888`, which is the **Jupyter Notebook Dashboard**. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-1.png) At this point, you can click File -> New -> Notebook to create a notebook: !(https://example.com/wp-content/uploads/2026/01/f8594e58-089c-44ac-9a9d-40c3145a80e1.png%22) You can also use the following method. ### 2. Creating Your First Notebook In the opened browser page (Dashboard): * Click the **New** button in the upper right corner of the page. * Select **Python 3 (ipykernel)** from the dropdown menu. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-2.png) * At this point, a new browser tab will open, which is a brand new, blank **Notebook document**. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-3.png) ### 3. Writing and Running Your First Code What you see now is a cell, which is the core of the Notebook. * In the first cell, enter: print("Hello, Jupyter! I am from Tutorial!") * Press `Shift + Enter` to run this cell. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-4.png) You will immediately see the output `Hello, Jupyter! I am from Tutorial!` below the cell, and the interface will automatically create a second blank cell for you. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-5.png) After completion, a new cell will be generated. Paste the following code into it: ## Example # This is a code cell print("Hello, Jupyter!") print("1 + 2 =",1 + 2) # Try running this cell (Shift+Enter) and see the result! **Expected Run Result**: Hello, Jupyter!1 + 2 = 3 !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-6.png) ### 4. Understanding Cell Types Cells have two main modes (switchable via the toolbar dropdown menu): * **Code**: Used for writing and executing code (default). * **Markdown**: Used for writing formatted text descriptions. For example, you can enter `# This is a title`, then run it (Shift+Enter), and it will be displayed as a large heading. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-7.png) Try changing the type of a new cell to **Markdown**, then enter `## This is my data analysis project`, run it and see the effect. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-8.png) ### 5. Saving and Closing * **Saving**: The Notebook will automatically save periodically. You can also click the **Save icon** (floppy disk shape) on the toolbar to save manually. Your notebook will be saved as a file with the extension `.ipynb`. * **Closing**: Simply close the browser tab to close the notebook. To **stop the entire Jupyter service**, go back to the initial command line window, press `Ctrl + C` twice, and then confirm the shutdown according to the prompt. !(https://example.com/wp-content/uploads/2026/01/jupyter-install-tutorial-9.png)