Answers

1. Interactions are used to add dynamic changes to your page without having to reload the page.
2. Click, Change, and OnActionSuccess triggers.

Click triggers activate when you click on the given component. Change triggers work when someone types in a field, for example. Of course, there are a lot more interactions available beyond just these three.

3. Interactions can target almost any component. Usually, the target type has been defined already by default, so you don’t accidentally target something that would be invalid.
4. We need to set permissions so data is retrieved securely. If a specific role isn’t allowed to view some data, then that data will not be retrieved and an error will be shown in the component.