A collection of useful links to relevant documentation.
https://jupyter.org/documentation
Documentation for Jupyterlab:
https://jupyterlab.readthedocs.io/en/latest/
Documentation for Jupyter Notebook:
https://jupyter-notebook.readthedocs.io/en/stable/
General nbgrader documentation:
https://nbgrader.readthedocs.io/en/latest/
An example of a workflow for creating an assignment with the nbgrader extension:
https://github.com/havardei/notebooks/blob/master/doc/tutorial.md