I clicked the button on the first page to continue but it gave me the message “You have now completed the whole course. Congratulations!” but I have not started anything yet. Also, it shows Unit 1 on the upper left, so where are the other units.
Hello, I hope you are doing well!
The “Android Apps for Arduino with MIT App Inventor 2” is an eBook in PDF format, so in Unit 1 you can download the full eBook in PDF format for offline usage: https://rntlab.com/module-1/welcome-to-android-apps-for-arduino-with-mit-app-inventor-2/
The PDF eBook comes with everything that you need to complete each project inside.
I hope that helps. I apologize for the confusion. Thanks!