This guide will walk you through how to export products into CSV file in Magento 2.
Step 1: Log into your Magento backend. Go to System > Data Transfer > Export
Step 2: In Export Settings page, select Products under Entity Type.
Step 3: Check the boxes on which attributes you want to exclude from your CSV. Then, click Continue.
After export succeeds, you will get a .csv file of all your products. You can use this file to import the products into other Magento 2 sites.
Related post: How to Export Orders to CSV in Magento 1 & 2