how do i keep cats out of my christmas tree

Well, one way is to put aluminum foil around the bottom of the tree. Cats usually don't like the feel of it and will stay away. Another way is to hang a few small ornaments that jingle on the lowest branches, so that when the cat tries to climb it, the ornaments will make noise and scare it off. Finally, you can try spraying the tree with a mixture of water and citrus essential oils, which cats generally don't like the smell of.