Basic usage procedures
Interesting extensions
How to purge data
There are plugins that can do this:
but they are very slow as they are NOT using direct SQL commands.
Importing CSV or XML data
Using WP All Import plugin
Importing / Taxt Classes
Use Woocommerce slugs for Tax Classes: standard, reduced-rate or
zero-rate.
Importing / Images
I decided to make a SEO friendly image filenames, so I needed an extra function to create unique filename:
<?php
function slugify($text, $delimiter = '-') {
  $url = iconv('UTF-8', 'ASCII//TRANSLIT', $text);
  $url = preg_replace("/[^a-zA-Z0-9\/_|+ -]/", '', $url);
  $url = strtolower(trim($url, '-'));
  $url = preg_replace("/[\/_|+ -]+/", $delimiter, $url);
  return $url;
}
function slugify_product_image_filename($title, $sku) {
  return slugify($title) . '_' . slugify($sku);
}
?>