Activity Application Email Notifications

We’re attempting to update the default activity application form and wanted to know if there was a way to update the activity application email notifications? For instance, if we added course application status terms in the taxonomy section, are we also able to add an email notification to the new terms?

Follow up question, is there a guide available on updating the activity application that can be referenced? I know the support section says not to tackle it ourselves, but anything I can do myself I would prefer to, and I remember having some training on it previously.