I'd like to import and export using two Magento 2, among two environments. I know that I can't do it natively, so how can I do using MySQL or some free tool?
If you are importing/exporting categories on the same Magento, which means both Magento has same EAV category attributes, you can use the native way to export SQL to the destination.
Using HeiSQL, use export database then tick all table with catalog_category prefix and export to your server database directly.
setup:backup --db
andsetup:rollback --db-file="..."
command-line? – Nolwennig Nov 14 '17 at 14:49