By default, to copy on Mac, you need to use the Command+C shortcut. If you want to enable the Ctrl+C shortcut for the copying command, you can set it up in the Mac shortcuts.
Open System Preferences → go to the Keyboard section.
In the Keyboard tab, click the Modifier Keys… button
For the Control Key, select Command. For the Command Key, select Control.
Click OK.
After this, on Mac, you can use the Ctrl+C shortcut to copy files, texts, and other items.