Creating Simple Product using WooCommerce CRUD

<?php
$objProduct = new WC_Product();

$objProduct->set_name('My Product 1'); //Set product name.
$objProduct->set_status('publish'); //Set product status.
$objProduct->set_featured(TRUE); //Set if the product is featured.                          | bool
$objProduct->set_catalog_visibility('visible'); //Set catalog visibility.                   | string $visibility Options: 'hidden', 'visible', 'search' and 'catalog'.
$objProduct->set_description('My custom long description'); //Set product description.
$objProduct->set_short_description('My short description'); //Set product short description.
$objProduct->set_sku('U-123'); //Set SKU

$objProduct->set_price(5.00); //Set the product's active price.
$objProduct->set_regular_price(5.00); //Set the product's regular price.
$objProduct->set_sale_price(); //Set the product's sale price.
$objProduct->set_date_on_sale_from(); //Set date on sale from.                              | string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if their is no date.
$objProduct->set_date_on_sale_to();//Set date on sale to.                                   | string|integer|null $date UTC timestamp, or ISO 8601 DateTime. If the DateTime string has no timezone or offset, WordPress site timezone will be assumed. Null if their is no date.

$objProduct->set_manage_stock(TRUE); //Set if product manage stock.                         | bool
$objProduct->set_stock_quantity(10); //Set number of items available for sale.
$objProduct->set_stock_status('instock'); //Set stock status.                               | string $status 'instock', 'outofstock' and 'onbackorder'
$objProduct->set_backorders('no'); //Set backorders.                                        | string $backorders Options: 'yes', 'no' or 'notify'.
$objProduct->set_sold_individually(FALSE); //Set if should be sold individually.            | bool

//$objProduct->set_weight(); //Set the product's weight.
//$objProduct->set_length(); //Set the product length.
//$objProduct->set_width(); //Set the product width.
//$objProduct->set_height(); //Set the product height.

//$objProduct->set_upsell_ids($upsell_ids); //Set upsell IDs.                               | array $upsell_ids IDs from the up-sell products.
//$objProduct->set_cross_sell_ids($cross_sell_ids); //Set crosssell IDs.                    | array $cross_sell_ids IDs from the cross-sell products.

$objProduct->set_reviews_allowed(TRUE); //Set if reviews is allowed.                        | bool

//$objProduct->set_purchase_note($purchase_note); //Set purchase note.                      | string $purchase_note Purchase note.


$attribute = new WC_Product_Attribute();
$attribute->set_id(wc_attribute_taxonomy_id_by_name('pa_color')); //if passing the attribute name to get the ID
$attribute->set_name('pa_color'); //attribute name
$attribute->set_options(['red']); // attribute value
$attribute->set_position(1); //attribute display order
$attribute->set_visible(1); //attribute visiblity
$attribute->set_variation(0);//to use this attribute as varint or not

$raw_attributes[] = $attribute; //<--- storing the attribute in an array

$attribute = new WC_Product_Attribute();
$attribute->set_id(25);
$attribute->set_name('pa_size');
$attribute->set_options(['XL']);
$attribute->set_position(2);
$attribute->set_visible(1);
$attribute->set_variation(0);

$raw_attributes[] = $attribute; //<--- storing the attribute in an array

$objProduct->set_attributes($raw_attributes); //Set product attributes.                   | array $raw_attributes Array of WC_Product_Attribute objects.

$objProduct->set_category_ids($term_ids); //Set the product categories.                   | array $term_ids List of terms IDs.
$objProduct->set_tag_ids($term_ids); //Set the product tags.                              | array $term_ids List of terms IDs.

$objProduct->set_image_id(); //Set main image ID.                                         | int|string $image_id Product image id.
$objProduct->set_gallery_image_ids(); //Set gallery attachment ids.                       | array $image_ids List of image ids.

$new_product_id = $objProduct->save(); //Saving the data to create new product, it will return product ID.