What is ACF flexible content?
Advanced Custom Fields, also known as ACF, has a field type called Flexible Content that is used to add an unlimited number of layouts which can be reordered and reused to populate your posts/pages with content in a structured manner.
What is Acf_fc_layout?
The acf_fc_layout is the module you want to display. If the module included any fields that needed to be filled in, you would include those in the array as well (ex: 'title' => 'My Module Title' ).
What ACF extended?
ACF Extended adds a new layer of compatibility for Polylang. ACF Options Pages and all ACF Extended Modules (Dynamic Post Type, Taxonomy, Options Pages, Block Type) are compatible. ACF Extended adds a new layer of compatibility for WPML.