Remember the Coursera Honor Code!
Try and get at least a working code by yourself. You can refer to this after you have tried once!
I have tried to solve ungraded / optional exercises as well. But in few situations did not spend enough time to match the outputs.
Once you are done with the submission, you can use these instructions to download your work : https://learner.coursera.help/hc/en-us/articles/360004990332-Download-Jupyter-Workspace-files