Free for a period, with your card already stored. It does not end when the trial does — it converts, unless you cancel before the date.
The drawing that proves the sentence above. It is the same card that is in the book.
Think of it as
a test drive where you've already signed the papers.
For example
It is free for thirty days and you give your card to start. On day thirty-one it charges, because nobody was ever going to remind you.
This is one card out of 275.
The hundred words you meet most are free — the whole set, animated, in one file that works with no internet.
Volume 1 has all 275 in fifteen chapters, with Staying Safe the largest chapter on purpose.