Windows: Ctrl + C
Windows (copy selected file/folder): Ctrl + C
Windows (copy in browser/address bar): Ctrl + C
macOS: Command (⌘) + C
macOS (copy selected file/folder): Command (⌘) + C
Linux: Ctrl + C
Chromebook: Ctrl + C
Copy text in terminal/shell (common): Ctrl + Shift + C
Copy selected text in terminal (depending on terminal): use the terminal’s selection then press Ctrl + Shift + C