There are also instructions on that page you can follow (installation via pip) if you already have a reasonably modern version of Python installed, and you have an appropriate C compiler available. This is a pain to configure if you are using a Windows machine.
Assuming the 'jupyter notebook' command succeeds, a browser window should pop up, displaying a UI for manipulating individual notebooks.
If you have already successfully completed the installation, and are instead looking for guidance on using Jupyter Notebook itself, then your best bet would be to look at some of the examples: https://try.jupyter.org/
There are also instructions on that page you can follow (installation via pip) if you already have a reasonably modern version of Python installed, and you have an appropriate C compiler available. This is a pain to configure if you are using a Windows machine.
Assuming the 'jupyter notebook' command succeeds, a browser window should pop up, displaying a UI for manipulating individual notebooks.
If you have already successfully completed the installation, and are instead looking for guidance on using Jupyter Notebook itself, then your best bet would be to look at some of the examples: https://try.jupyter.org/