I’ve found threads that tell me how to import, but I don’t really understand the concept behind Importing. What do I use it for?
You use it to study material that’s not on LingQ.
You can import and share lessons that are not copyrighted or for which you have got a permission to share.
Or you can import copyrighted content for your private use. Just remember that free members can import a max. of 5 private lessons (while there are no limits to shared lessons).
More information in the HELP section: Import Help
Hope it helps,