Importing attributes

To import the attributes and variations, you need the Premium version: https://www.fredericgilles.net/fg-magento-to-woocommerce/

For the brands, you also need the Brands add-on: https://www.fredericgilles.net/fg-magento-to-woocommerce/brands/

Please note that you will have to restart the import from scratch with the Premium version to import the products with their attributes and variations.

Thanks, all I wanted to know for now.