These are the concepts being pointed out:
Title page- has the books author and title on it in the front of a book.
Table of Contents- Located at the front of a book, the table of contents displays a list of the big ideas within the book and where to find them.
Index- An index is an alphabetical list of almost everything covered within the book, with page numbers. Readers can use the index to look up specific terms or concepts and go right to the specific information they're looking for.
Glossary- Located at the back of the book, a glossary contains key words that are related to the topic and their definitions. These definitions provide more information about new vocabulary words.
Review those terms before moving on