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<?php
function remove_menus(){
  
  remove_menu_page( 'index.php' );                  //Dashboard
  remove_menu_page( 'jetpack' );                    //Jetpack* 
  remove_menu_page( 'edit.php' );                   //Posts
  remove_menu_page( 'upload.php' );                 //Media
  remove_menu_page( 'edit.php?post_type=page' );    //Pages
  remove_menu_page( 'edit-comments.php' );          //Comments
  remove_menu_page( 'themes.php' );                 //Appearance
  remove_menu_page( 'plugins.php' );                //Plugins
  remove_menu_page( 'users.php' );                  //Users
  remove_menu_page( 'tools.php' );                  //Tools
  remove_menu_page( 'options-general.php' );        //Settings
  
}
add_action( 'admin_menu', 'remove_menus' );

<?php
function remove_posts_menu() {
    remove_menu_page('edit.php');
}
add_action('admin_init', 'remove_posts_menu');