Text features are about the presentation of the written word, whether that be a story, article or poem. The purpose of 'informational text features' is to help you find your way in a text more easily as well as provide additional information to improve the reader's comprehension.
Next time you are in the library, pick a selection of books, one fiction, one non-fiction and perhaps a newspaper too. Spend some time looking through the books (and paper) and see how many text features you can recognise. You will need to look at the first few (and last few) pages of books to see some of the features.
This 11-plus English quiz will give you an introduction to informational text features used in books and similar literary works. See how much you remember from your lessons.