Liverpool enjoyed themselves at Old Trafford on Sunday, beating Manchester United 3-0. The Reds headed into the game in good form, having won their first two games of the season in the Premier League. But facing their biggest rivals on their own patch is a whole different kettle of fish. It was a big test for Liverpool. In the end, it was one which the Reds – and head coach Arne Slot – passed with flying colours. For Slot, it was an absolutely enormous moment. The Dutchman has handled the transition from Jurgen Klopp even better than could ever have been hoped at Anfield. Arne Slot details tac…