Use a table of contents to find a chapter and an index to find a specific topic quickly.
The TABLE OF CONTENTS is at the FRONT of a book. It lists chapter titles in order with their page numbers, so you can find a whole chapter fast. The INDEX is at the BACK of a book. It lists specific words in ABC order with page numbers, so you can find one exact topic even if you do not know which chapter it is in.
Think of it this way: the table of contents helps you find a big section, and the index helps you find one small detail buried anywhere in the book.
Mastery looks like: They correctly choose between table of contents and index depending on whether they need a whole chapter or one specific topic, and can read page numbers from either.
Common stumbles: Confusing the two tools; not realizing the index is alphabetical, which slows down the search.