Learning QuickBooks is fun, Marlee s. I'm here to help you transfer the transactions.
You can do it by creating a backup copy from QuickBooks 2016, then restoring it to the 2019 version.
Although, if QuickBooks 2019 has transactions that aren't in the older version, you'll have to manually enter them instead. This will prevent us from overwriting or messing up the 2019 data.
In any case you have other concerns, you can get back to this thread.