Once placed, can you move a housing item from one house to another or back in your attic? Anotherwards if I place my Ravenwood Banner from the Enrollment quest, is it stuck in that house or can I move it to another house I might buy in the future?
Sure, you can move or pickup items after you place them. Click on the housing button that’s over the spellbook and then click on the item you want to move or pick up.
For more information see the Housing section of the Wizard101 Handbook or the housing help pages in your spellbook.