In fact, in some situations you might find it easier to share something rather than copying and pasting it — the selected text and image will automatically be inserted in the app you choose. The Copy option also appears on the Share menu, if you need it.
Then there’s the Universal Clipboard feature: If you have an iPad or Mac signed into the same Apple ID with Wi-Fi and Bluetooth enabled, and the Handoff functionality turned on, all these devices will share a clipboard.
That means you can copy something on your iPhone, then switch to your Mac to paste it somewhere, or vice versa. It’s important to be aware of Universal Clipboard, even if you don’t want to use it — otherwise, you might find yourself copying and pasting content between devices when you don’t really want to.