I used to use Flash Card assistant with my french program, do you have something similiar.
LibreOffice is a software package that can be used to do many things. This forum is concerned with how to use the software effectively, not what to produce. While it is possible that someone here has already created flash cards, you are more likely to find what you need by using DuckDuckGo or Google to search for a flash card product that has already been produced.