Now we can Edit the Site, including headers and footers.
It is a FREE functionality that is lets say A FREE ELEMENTOR PRO. (WP 5.9)
google says
What is Gutenberg editor in WordPress?
Gutenberg is the code name for the new block based editor introduced in WordPress 5. It replaces the classic WordPress editor which is built on TinyMCE. It is a significant change in how content is created. With Gutenberg, you can add multiple media types and arrange the layout within the editor using blocks.