Import questions - MoodleDocs

https://docs.moodle.org/32/en/Import_questions

Import and export FAQ - MoodleDocs

https://docs.moodle.org/32/en/Import_and_export_FAQ

GIFT format - MoodleDocs

https://docs.moodle.org/32/en/GIFT_format

Aiken format - MoodleDocs 

https://docs.moodle.org/32/en/Aiken_format

Moodle XML format - MoodleDocs

https://docs.moodle.org/29/en/Moodle_XML_format