Use Handoff on your Mac
With Handoff, you can continue on one device where you left off on another. Work on a presentation on your Mac mini, then continue on your iPad. Or start an email message on your iPhone, then finish it on your Mac mini. View a message on your Apple Watch, and respond to it on your Mac mini. You don’t have to worry about transferring files. When your Mac mini and devices are near each other, an icon appears in the Dock whenever an activity can be handed off; to continue, just click the icon.
Note: To use Handoff, you need an iPhone, iPad, or iPod touch with the Lightning or USB-C connector and iOS 8 (or later) or iPadOS installed. Make sure your Mac mini, iOS device, or iPadOS device have Wi-Fi and Bluetooth turned on and are signed in with the same Apple ID.
Turn on Handoff on your Mac mini. Click the System Preferences icon 
in the Dock, click General, then select “Allow Handoff between this Mac and your iCloud devices.”
Turn on Handoff on your iOS or iPadOS device. Go to Settings > General > Handoff, then tap to turn on Handoff. If you don’t see the option, your device doesn’t support Handoff.
Turn on Handoff on your Apple Watch. In the Apple Watch app on iPhone, go to Settings > General, then tap to turn on Enable Handoff.
Handoff works with Safari, Mail, Calendar, Contacts, Maps, Messages, Notes, Reminders, Keynote, Numbers, and Pages.
Learn more. See Pick up where you left off with Handoff in the macOS User Guide.