I’m trying to create certain modulair blocks which I can add to multiple pages in WordPress. But I use sidebar-[name].php files for this, what is the best practice for this? Should you add them to a function or add them in a sidebar…
It feels Kinda off using many sidebar’s. It would be nice if I could add them to a sub-folder in the template. Checkout the image. How do you do this?

I would say to add them as template parts as in content-[name].php. For instance in page.php
you could have something like:
<?php while ( have_posts() ) : the_post(); ?>
<?php if (is_page( 'home' ) ){
get_template_part( 'content', 'benefits' );
} elseif (is_page( 'Contact' ) ){
get_template_part( 'content', 'contact' );
}
}
get_template_part( 'content', 'popup' ); ?>
<?php endwhile; // end of the loop. ?>
It seems to make more sense as it is content after all.