Each situation and each individual is different, and there are indeed many paths to better presentations, including better preparation. My personal approach moving from rough analog sketches to digital slides is not uncommon at all. I have been surprised, however, that for the most part, individual professionals, entrepreneurs, and students usually just open up slideware, type about a dozen subject slides, and then fill them with talking points. This is not an effective approach, nor is it a method I recommend although it is common