Classic Editor
Classic Editor is the older WordPress editing screen used before Gutenberg and the block editor became the default.
Read the guide: Classic EditorElementor
Elementor is a popular WordPress page builder used to design pages with visual drag-and-drop controls.
Read the guide: ElementorPage Builder Migration
Page builder migration means moving a WordPress page from one editing system to another, such as Gutenberg to Elementor.
Read the guide: Page Builder MigrationGutenberg / Block Editor
Gutenberg, also called the WordPress block editor, is the default WordPress editing experience for building pages and posts with blocks.
Read the guide: Gutenberg / Block Editor