Is there a video that shows how to create a cascading form?
You can check out the Cascading Form example here and the other User Input examples here.
Is there a video that shows how to implement the code?
You can check out this video for creating a custom form and connecting it to a database, however this is for a regular form and not a cascading form. I hope it'll help.
How do I save with the Cascading Form, try connecting it to a dataset but show an error. How can I solve this problem?