Learn words

If I make a new word into a lingq and continue reading, will it automatically turn into a known word?
do I review or change it manually (when I think I understand)?

You change it manually when you think you understand it. (If you see the word later and don’t remember it any more, you can just change it back.)

Or, you can review your lingqs as flashcards, and each time you get a word correct, it will automatically be closer being a known word. Each time you get a flashcard correct, the word will automatically go ‘up’ one level, until it’s known.