https://wordpress.org/

Ajax call in front-end

In javascript section

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$.ajax({
    // ajaxurl is only in back-end
    url: '<?php echo admin_url('admin-ajax.php'); ?>',
    data: {
        action: 'my_unique_ajax_action',
        param1: 'my query string'
    },
    success: function(data, textStatus, jqXHR) {
        console.log(data);
    },
    complete: function(jqXHR, textStatus) {
        console.log(textStatus);
    },
    error: function(jqXHR, textStatus, errorThrown) {
        console.log(errorThrown);
    }
});

In your themes/awesome_theme/functions.php

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if (!function_exists('ajax_my_unique_action')) {

    function ajax_my_unique_action() {
        echo json_encode(array(
            'data1' => 'foo',
            'data2' => 'bar',
        ));
        header('Content-Type: application/json');
        exit;
    }

    // when user is logged in
    add_action('wp_ajax_nopriv_my_unique_ajax_action', 'ajax_my_unique_action' );
    // when user is not logged in
    add_action( 'wp_ajax_my_unique_ajax_action', 'ajax_my_unique_action' );
}
Reference:

Hide Add New submenu from custom post type

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function hide_add_new_custom_type() {
    global $submenu;
    // replace my_type with the name of your post type
    unset($submenu['edit.php?post_type=my_type'][10]);
}
add_action('admin_menu', 'hide_add_new_custom_type');
Reference:

Change admin edit user profile Nickname label

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function update_profile_label($translation, $original) {
    if ( 'Nickname' == $original ) {
        return 'Other name';
    }
    return $translation;
}
add_filter('gettext', array($this, 'update_profile_label'), 10, 2);
Reference:

Add featured image to post

Add the following code to theme’s functions.php

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add_theme_support( 'post-thumbnails' );
Reference:

Pagination get 404

Make sure the posts_per_page matched with the number in Admin
-> Settings -> Reading -> Blog pages show at most

Reference: