You can easily copy and paste between your Mac, iPhone, and iPad if you have the right settings enabled and are using compatible apps. Here's how to do it:
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[color=var(--tw-prose-bold)]Enable Handoff[/color]: Handoff allows you to start a task on one device and continue it on another. To enable Handoff on your Mac, iPhone, and iPad, go to Settings:

• [color=var(--tw-prose-bold)]On Mac[/color]: Go to System Preferences > General, then check the box for "Allow Handoff between this Mac and your iCloud devices."
• [color=var(--tw-prose-bold)]On iPhone/iPad[/color]: Go to Settings > General > AirPlay & Handoff, then toggle on "Handoff."

[color=var(--tw-prose-bold)]Ensure iCloud is enabled[/color]: Make sure you're signed in to the same iCloud account on all devices.

[color=var(--tw-prose-bold)]Use Compatible Apps[/color]: Not all apps support Handoff. For seamless copy and paste functionality, use Apple's built-in apps like Safari, Notes, Pages, Numbers, Keynote, and some third-party apps that support Handoff.

[color=var(--tw-prose-bold)]Copy and Paste[/color]: Once Handoff is enabled and you're using compatible apps, copying and pasting between devices is straightforward:

• [color=var(--tw-prose-bold)]On Mac[/color]: Copy text or content as you normally would by selecting it and pressing Command + C. To paste on your iPhone or iPad, simply unlock your device, and you'll see a small app icon representing what you copied on your Mac at the bottom left corner of the lock screen or in the multitasking view. Tap on it, and the content will be pasted.
• [color=var(--tw-prose-bold)]On iPhone/iPad[/color]: Copy text or content by selecting it and tapping "Copy" or pressing and holding to bring up the copy menu. To paste on your Mac, simply open any compatible app, right-click where you want to paste, and select "Paste."

[color=var(--tw-prose-bold)]Universal Clipboard[/color]: If you're using macOS Sierra or later and iOS 10 or later, you can also use Universal Clipboard. It allows you to copy text, images, photos, and videos on one Apple device and paste it on another. Make sure Bluetooth and Wi-Fi are enabled on all devices and signed in with the same Apple ID.

With these steps, you should be able to seamlessly copy and paste between your Mac, iPhone, and iPad.