The greatest reason for using computers and software is that it can improve work efficiency. The key to improving efficiency lies in two aspects: having good software and knowing how to use it well. Mastering hotkeys proficiently is the foundation and essential method for efficient work. The following text lists the most practical shortcut keys for the most classic software, including operating systems, browsers, players, communication tools, file management tools, and text editors. It's important to note that the same global hotkey can only be effective for one program at a time.