How do I transfer my contacts from my Mac to my iPhone?

To transfer your contacts from your Mac to your iPhone, follow these steps:

1. Open the Contacts app on your Mac.
2. Select the contacts you want to transfer.
3. Click on File in the menu bar, and then click on Export.
4. Choose a location to save the exported file, and select the vCard format.
5. Connect your iPhone to your Mac using a USB cable.
6. Open the Finder app on your Mac, select your iPhone from the sidebar, and click on the Info tab.
7. Click on the checkbox next to 'Sync contacts with' and select 'Contacts' from the dropdown menu.
8. Click on the checkbox next to 'All contacts' or 'Selected groups', depending on which contacts you want to transfer.
9. Click on the 'Apply' button to start syncing your contacts to your iPhone.

Once the sync is complete, your contacts should be transferred from your Mac to your iPhone. If you have any issues or questions, consult the Apple Support website for further assistance.