How does LingQ know which words are new to me?

When you first join LingQ, all words are new to you. As you start reading through lessons, you will turn New Words into LingQs, or you will mark them as Known or Ignored. Through this process, our system learns which words you know and which you don't.

As the LingQ system tracks all words you know, it will continue to show you how many New Words (blue words) there are for you in each lesson.