Whenever a class is engaged in a heated discussion, generating ideas that you want to refer back to, it is a good idea to record the thoughts that get flung out, so that they do not get neglected at a later stage. Old-fashioned teachers used to use flip-charts, but the digital teacher has new tools available.
Mindmeister is an easy to use online mind mapping platform which allows you to create and share conceptual diagrams. The free version allows you to generate a side-show (Prezi style) but not to download this as a Powerpoint or other format. The free version only allows you to download as a Word outline, but you can do a screenshot and paste into Paint to create an image file. You can also share to Social Media, or copy a link.
Mind maps are created by starting with a title and adding topics and sub-topics using the tab key. You can customize the theme applied. It is fairly intuitive to learn.
I have found that it allows me to collate student contributions to a class discussion in a very tangible way on the Interactive White Board, grouping ideas and pulling together discussion threads. At the end of the lesson I take a screenshot and create an image file I can post on my Google Classroom as a record of what was discussed, and as a trigger for further work.