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From WordPress 5.0 release, the classic editor has been replaced with Gutenberg as the default editor. So if you are using WordPress, you need to use the new Gutenberg or go back to the classic editor to create a new page or post.
But why roll back when the new one is more comprehensive? Gutenberg also known as “Block Editor” introduces a new block-based approach to content creation with more flexibility and ease.
So you need to have a basic to advanced understanding of the Gutenberg block editor. And this blog will make things easy for you.