Now I'm importing and exporting product details to magento
so anyone have procedure for modify CSV file for import and export
Magento native provide import and export for products, customer and customer address.
You need to log in with admin panel,
GO To System from the left side panel,
Click on Data Transfer -> Import link for Import Products.
Click on Data Transfer -> Export link for Export Products.
You need to just download CSV file from backend,
System -> Data Transfer -> Export
You got Catalog_product.csv file which is the base file for import products in magento 2.