Confluence has a powerful search function. Start a quick search by typing GG whenever you are in view mode. You can also place your cursor into the search field in the menu. You'll see a drop-down list of recently viewed pages.
If what you're looking for isn't here, start typing the name of a page, blog post, person, file, attachment, or space. You'll see a quick overview of the search results immediately without having to press enter.
If you still can't find what you are looking for in this list, press enter, or click "Search for..." below the list of results. This starts a more comprehensive search where you can search using filters.
You can watch our Video #35 of the video tutorial series"Learn Atlassian Confluence" and read more about the search on this page of Atlassian's documentation.