Notes App: 1. Obsidian is the best. Simplenote is a close one. Used OneNote over the years. And tried many others for at least some weeks. 2. MS PowerPoint is

Notes App: 1. Obsidian is the best. Simplenote is a close one. Used OneNote over the years. And tried many others for at least some weeks. 2. MS PowerPoint is the best for making slides for talks/classes. Used Keynote and Impress seriously, too. 3. Used Windows, macOS, and Linux for very long times. Altgough Apple hardware in unparalleled, Linux as an OS does it for me. Endlessly tweakable at every level. 4. For learning fundamentally new things, nothing ever beats group study and group discussion. I have, as anyone else, studied alone, and in a class. Don't care about the quality of peers in study groups as long as they are motivated.