New App Design Considerations Part 3 - Implementing a Pop Up

Unless someone has a better idea, I will be using the CSSGrid with the flex properties, etc. It will have a header, footer, navigation indicator, and data presentation areas.

During the presentation of a question, the user may press a button for more information, or to get an extended list of answers, etc. that would be displayed over the presentation of the original question.

Cards, modals, toasts, jumbotron - all seem to allow data to be displayed and even entered. Which are best for what purposes?

It’s really up to you. Try playing with the different ones and see how they fit into your various use cases. You may actually use several of them. A little practice app which uses all of there might be a good way to get familiar with them.