Business rules only go so far. This course covers the client-side scripting model that powers everything else on a form — the form context, the events you can hook into, and how scripts get deployed as web resources.
What JavaScript can do on a form that a business rule can't.
The object every form script uses to read and change what's on screen.
OnLoad, OnChange, and OnSave — when each one fires and what it's for.
How a script file actually gets into Dynamics 365 CE and attached to a form.
A worked example: one small script, start to finish.