For a 3-D modelling course at university we were forced to use software that had no undo mechanism (and only ran on Windows). We very quickly learned to create

For a 3-D modelling course at university we were forced to use software that had no undo mechanism (and only ran on Windows). We very quickly learned to create save files after every single modification, because it was so easy to lose hours of work with a single mistake. In retrospect I wish I had looked for a way to import files from Blender-3D.