i have searched alot and didn't found any solution on How to rename the add post/page sidebar panel sections in wordpress without plugin. please check the screenshot marked red. if someone renamed these sections then it will be great help.

CodePudding user response：

You can change the category name using the init action

function revcon_change_cat_object() {
    global $wp_taxonomies;
    $labels = &$wp_taxonomies['category']->labels;
    $labels->name = 'category_new_label';
    $labels->singular_name = 'category_new_label';
    $labels->add_new = 'Add category_new_label';
    $labels->add_new_item = 'Add category_new_label';
    $labels->edit_item = 'Edit category_new_label';
    $labels->new_item = 'category_new_label';
    $labels->view_item = 'View category_new_label';
    $labels->search_items = 'Search category_new_labels';
    $labels->not_found = 'No category_new_labels found';
    $labels->not_found_in_trash = 'No category_new_labels found in Trash';
    $labels->all_items = 'All category_new_labels';
    $labels->menu_name = 'category_new_label';
    $labels->name_admin_bar = 'category_new_label';
}
add_action( 'init', 'revcon_change_cat_object' );

you can also change the tag labels like.. change this line

$labels = &$wp_taxonomies['post_tag']->labels;