Question

why it's important to write index before a note? ​

Answer 1

Explanation:

An index ( plural: usually indexes, more rarely indices; see below) is a list of words or phrases ('headings') and associated pointers ('locators') to where useful material relating to that heading can be found in a document or collection of documents. Examples are an index in the back matter of a book and an index that serves as a library catalog.

Answer 2

Answer:

Remember, you're striving for more than an alphabetical listing of key words with page numbers. It's also considerably easier to create an index consistent in structure and terminology if you wait until the book is complete. A good index enables the reader to find every pertinent statement made in a book.