When choosing a Christmas tree, there are a few things to keep in mind. The first is the size of the tree, as you'll want to make sure it fits in your home and isn't too large or too small. The second is the shape of the tree, as some people prefer a full and symmetrical tree while others prefer a more natural and uneven look. Finally, you'll want to consider the type of tree, as some species are more fragrant and long-lasting than others.