Magento 2 provides import of configurable products features or not ? if it provides, how should i import configurable products in magento 2 ?
Magento 2 provides utility to import configuarble product with it's associated product via CSV
Please refer following link.
Please check below link to get proper idea for import & export product in Magento 2
Here is sample csv for configurable products import https://github.com/firebearstudio/magento2-import-export-sample-files/blob/master/Improved%20Import%20:%20Export%20-%20Sample%20Files/products_configurable_improved.csv
Complete guide to import of configurable product with examples - https://firebearstudio.com/blog/the-complete-guide-to-magento-2-configurable-products.html