Check out org mode (very complex and advanced task management / todo list system, calendar, etc), org roam (basically all the features of Obsidian), the ability

Check out org mode (very complex and advanced task management / todo list system, calendar, etc), org roam (basically all the features of Obsidian), the ability to act as an email client, having a cross platform system shell independent shell (in elisp), and of course just general emacs architecture things like the ability to hot reload and replace and debug and inspect and get docs on and add to and modify every part of the editor