Follow below steps to create CSV to import product. Here we have explained how to create CSV for importing product with Magento 2 default attributes.
Step 1: Download sample CSV using this link http://rootways.com/shop/media/blog/product_import_format.csv
Step 2: Follow the steps shown in this video. Click here to view.
Step 3: That’s it.
NOTE: If you have added extra attribute of products then you have to add those attributes in this CSV.