The Home page is determined by the Confluence Administration > Further Configuration > Site Homepage setting. When a user logs in, they will be taken to that page (or whatever alternate home page they've specified in their Profile) and likewise when you click the home button (the big button that by default says "Confluence" on the left of the banner) you'll be taken to that page.
There's no way to specify more than one home page for Confluence, although as a workaround you can ask your logged in users to change their profiles so that their home page is different to the default homepage. This means that anonymous users will go to the default homepage and logged in users will go to a different home page (but there's no way in Confluence to force users to change their homepage).
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