It scrambles everything traveling between you and the site, so nobody in between can read it. It says nothing at all about whether the site itself is honest.
The drawing that proves the sentence above. It is the same card that is in the book.
Think of it as
a sealed envelope, which says nothing about the sender.
For example
You see a small padlock beside the address. What you type is now sealed on the way — though the padlock says nothing about who is at the other end.
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.