WooCommerce Queries

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Good Day,

I am fairly new to WordPress and WooCommerce.
But I am fairly versed in PHP and MySQL.
So my question is, how do I go about making a specific query for WooCommerce where I can point it to specific meta. For example, if I wanted to make a query to call all the different categories within WooCommerce>
I would normally call it like this;

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$args = array(
            'number' => 'null',
            'orderby' => 'name',
            'order' => 'ASC',
            'columns' => '4',
            'hide_empty' => '1',
            'parent' => '',
            'ids' => ''
)

Ok so that would be my query, now what I am so struggling with is what do I do with it it now? Cause that part there is what everyone shows, no one tells you or shows you how to actually use the query or where to start.
I have used the basic WP query function, but then the only categories I receive back come from WP and WC.
So how do I point it directly to WC?
Furthermore, these hooks annoy me so. So how do I go about doing it the normal way, bypassing WC and WP functions and build my own query; 

 $query = "SELECT * FROM wc_categories";
 $result = mysql_query($query);
 $temp_array = mysqli_fetch_array($result);

That is how I would love to do it, cause no one explains hooks and how to use it, or edit it, everyone assumes that you are pro-leet when it come to familial of WP workings.

So if anyone can point me in the right direction, I would really appreciate it.
And I would love you long time if you could explain to me how to go about my 2nd code block cause that is my preferred way.

Kind Regards,
DK

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  1. Creating query using standard wp/wc function is easy. For example if you want to get customer details for specific orders. Required codes might look like this (notice the global function):

    global $post, $woocommerce, $the_order;
if ( empty( $the_order ) || $the_order->id != $post->ID )
    $the_order = new WC_Order( $post->ID );

$user_info = get_userdata( $the_order->user_id );
$biling_email = $the_order->billing_email;
$phone_no = $the_order->billing_phone;

    If you want to query a custom order meta field, you may use a code something like below. You need to know the custom field name in database:

    $custom_field = get_post_meta( $post->ID, 'custom_field', true );

    For custom query you need to initialize global wpdb function first by adding global $wpdb function before your query. Even this will work with a WP page only, it’ll not work with a page created outside WP. Below is an example:

    global $wpdb

$table = $wpdb->prefix . 'postmeta'; //Good practice
$orderno = $wpdb->get_results( "SELECT * FROM $table");