To make learning more intresting you can create group of words, what you want to learn. That group can be one lesson, book, movie text or simply some words. To create group from book or movie subtitle file:

1. Download book or subtitle file from Internet (a lot of books available from Gutenberg or ask Google).
2. Go to Groups section.
3. Click "..." button to open book or subtitle file.
4. Edit file if necessary.
5. Enter Group name.
6. Click Group to make group from words our Auto Group to make many smaller groups (5 by default).
7. Add unknown words to dictionary, if necessary.