Once your website has been upgraded and you log in to work in TYPO3 version 12, you will experience a number of changes. The most important and notable changes are listed here. We are continuously working on updating the TYPO3 guides to version 12, so they reflect the below mentioned changes.
The editor in TYPO3 version 12 has many of the same functionalities as in version 10. However, a few functionalities have been removed. You cannot use the following functionalities in TYPO3 version 12:
Editors can still use Copy+Paste keyboard shortcuts in the editor