find vs find out

Find is for locating physical objects; find out is for discovering information.

locating a physical object or person

I need to find my passport before we leave for the airport.

find out

discovering facts, news, or hidden information

We need to find out what time the train actually arrives.

Watch out

I need to find out my lost wallet.

I need to find my lost wallet.
Call the hotel to find the check-in time.

Call the hotel to find out the check-in time.

Remember Find the keys; find out the truth.

Quick check

Fill the gap with one of the two options.