TYPO3 v9 has reached its end-of-life September 30th, 2021 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.
Let us conclude this overview of working with pages by mentioning a useful feature. At the top of the page tree is a filtering tool. It can be used to search in the page tree, using either words (which will be matched to the page title) and numbers (which can also be matched to the id of a given page).