Everyone knows you buy a tree at the tree store. Sorry just something my kids say like you buy a dog at a dog store, and a baby at a baby store.
We have two trees. I am not a tree expert but i have heard when you water them do it very slowly for about an hour so the water soaks slowly into the roots.
We bought two trees at Art Knapps and one at a nursery that didn't do vrey well, I think it was because the tree was in a fairy shady area and our yard gets a lot of sun so I think it was too much of a shock to come to our yard.