How to Register Taxonomy in WordPress

Open your wp theme functions.php file and paste the whole code.

<?php

// hook into the init action and call create_book_taxonomies when it fires

add_action( 'init', 'create_book_taxonomies', 0 );

// create two taxonomies, genres and writers for the post type "book"

function create_book_taxonomies() {

 // Add new taxonomy, make it hierarchical (like categories)

 $labels = array(

  'name'              => _x( 'Genres', 'taxonomy general name', 'textdomain' ),

  'singular_name'     => _x( 'Genre', 'taxonomy singular name', 'textdomain' ),

  'search_items'      => __( 'Search Genres', 'textdomain' ),

  'all_items'         => __( 'All Genres', 'textdomain' ),

  'parent_item'       => __( 'Parent Genre', 'textdomain' ),

  'parent_item_colon' => __( 'Parent Genre:', 'textdomain' ),

  'edit_item'         => __( 'Edit Genre', 'textdomain' ),

  'update_item'       => __( 'Update Genre', 'textdomain' ),

  'add_new_item'      => __( 'Add New Genre', 'textdomain' ),

  'new_item_name'     => __( 'New Genre Name', 'textdomain' ),

  'menu_name'         => __( 'Genre', 'textdomain' ),

 );

 $args = array(

  'hierarchical'      => true,

  'labels'            => $labels,

  'show_ui'           => true,

  'show_admin_column' => true,

  'query_var'         => true,

  'rewrite'           => array( 'slug' => 'genre' ),

 );

 register_taxonomy( 'genre', array( 'book' ), $args );

 // Add new taxonomy, NOT hierarchical (like tags)

 $labels = array(

  'name'                       => _x( 'Writers', 'taxonomy general name', 'textdomain' ),

  'singular_name'              => _x( 'Writer', 'taxonomy singular name', 'textdomain' ),

  'search_items'               => __( 'Search Writers', 'textdomain' ),

  'popular_items'              => __( 'Popular Writers', 'textdomain' ),

  'all_items'                  => __( 'All Writers', 'textdomain' ),

  'parent_item'                => null,

  'parent_item_colon'          => null,

  'edit_item'                  => __( 'Edit Writer', 'textdomain' ),

  'update_item'                => __( 'Update Writer', 'textdomain' ),

  'add_new_item'               => __( 'Add New Writer', 'textdomain' ),

  'new_item_name'              => __( 'New Writer Name', 'textdomain' ),

  'separate_items_with_commas' => __( 'Separate writers with commas', 'textdomain' ),

  'add_or_remove_items'        => __( 'Add or remove writers', 'textdomain' ),

  'choose_from_most_used'      => __( 'Choose from the most used writers', 'textdomain' ),

  'not_found'                  => __( 'No writers found.', 'textdomain' ),

  'menu_name'                  => __( 'Writers', 'textdomain' ),

 );

 $args = array(

  'hierarchical'          => false,

  'labels'                => $labels,

  'show_ui'               => true,

  'show_admin_column'     => true,

  'update_count_callback' => '_update_post_term_count',

  'query_var'             => true,

  'rewrite'               => array( 'slug' => 'writer' ),

 );

 register_taxonomy( 'writer', 'book', $args );

}

book is a custom post type you can use post for post type.