Douglas Luiz goes as a "loan" with obligation to buy. That means, they are going to pay his salary for this year, and then they are paying 3 million to Juventus to loan him, and at the end of the season they are going to end up with a 30 million purchase instead. That is going to be a lot better for all of us and we are going to see Notthingham use him a lot better.
Of course it is not that complicated but I still wonder why he didn't worked out well in Juventus, that's a good player and he deserved to be played and if he was given enough time then we would see him play a great game if Juventus gave him any chance. But for some reason they didn't really worked out together, not sure if that is bad though, he can do great at Forrest.