I want to list categories, sub categories and products

Take a look at using WP_Query class for that…

Would you be able to supply a quick example?

Thanks.

Some code i came across which outputs categories but not products:

function get_product_terms( $term_id ) {

		$html = '';

		$args = array( 'hide_empty' => 0, 'parent' => $term_id );

		$terms = get_terms('product_cat', $args);

		foreach ($terms as $term) {

			$html .= '<li';

			if( $term_id == 0 ) {

				$html .= ' class="top_li"';

			}

			$html .= '><a href="'.get_term_link($term->slug, 'product_cat').'">' . $term->name . '</a>';	

			if( $list = get_product_terms( $term->term_id )) {

				$html .= '<ul class="second_level">'.$list.'</ul>';

			}

			$html .= '</li>';

		}

		return $html;

	}

	if( $list = get_product_terms( 0 )) {

		echo '<ul id="top_ul">'.$list.'</ul>';

	}

Here are all the instructions you need -> https://codex.www.ads-software.com/Class_Reference/WP_Query