Hi Kate,
Pages creates two types of document: Word processing documents and Page Layout Documents.
Word processing documents (your document is this type) contain a "document body" which contains the body text and any objects inserted inline with that text. Other objects (images, tables, charts, shapes, text boxes) may be added to the document, and set to Stay on Page or to Move with Text.
Word Processing documents are designed for documents containing mostly text, and for text that flows from the beginning of the document to its end in one continuous stream. The number of pages in this type of document is determined by how many are needed to accomodate the text. As more text is added, Pages automatically creates a new page when it is needed and drops a page when there is no text to flow onto it.
WP docs start with a single Section (think 'chapter'), but may be divided into multiple Sections by Inserting Section breaks (Insert menu).
When deleting or moving pages from a Word Processing document, the unit is a Section. When you delete a page, you delete the Section containing that page. To delete or move a single page you have two choices:
Isolate that page and its contents in a Section of its own by inserting a section break at the end of the page and another at the end of the preceding page, then delete the one-page section containing the target page.
OR
Select and delete (or Cut) the content of that page. With no text on the page, the page itself is not needed and will disappear.
Note that the body text AND objects placed on that page cannot be selected at the same time. You may need to create an empty page (using a Page break) where you want everything to be moved to, then move the objects using Cut and Paste, then move the text with a separate cut and paste.
Page Layout Documents are designed for single pages, or a collection of independent and self-contained pages. They contain no Document Body, so any text to be placed on the page needs to be placed in a container—a text box, or a shape. Each Page in a Page Layout document is in a separate Section, so to insert a new Page, you use Insert > Page. Sections can be reordered by selecting the section thumbnail in the left sidebar and dragging it to a new place in the order.
Regards,
Barry
PS: Description fits Pages 5 in El Capitan. There may be differences with Pages 6 in Sierra or High Sierra.
B
