Easily make flash cards with apps you already have

The other day, a friend asked for help on how to create and manage digital flash cards. During his ideation phase for writing a book he is in the habit of writing each idea in a flash card, then laying out all the cards in the floor, to rearranging them, throwing-away ideas he didn’t like or to rewriting a few cards. While this has been super useful to him, it was difficult to handle physical flash cards, and was a lot of paper wastage. He wanted a simple app to do this. Yes, he had tried a few mind-mapping and specialised software, but like them, as they required relearning or were difficult, he will not be using them every day to justify the investment.

I suggested he try out Microsoft PowerPoint (or) Google Slides to achieve what he wanted easily.