The easiest way to customize a WYSIWYG editor - CKEditor 5 online builder
Development tools - CKEditor 5 Documentation
GitHub - ckeditor/ckeditor5-build-classic: The classic editor build of CKEditor 5.
GitHub - ckeditor/ckeditor5: Powerful rich text editor framework with a modular architecture, modern integrations, and features like collaborative editing.
How to use CKEditor in PHP Installation and Uses - Ebhor.com
CKEditor 5 keyboard shortcuts ‒ defkey
html - CKEDITOR 5 - Remove "Insert Media" option from ClassicEditor - Stack Overflow