I believe Liverpool's ground is (or was until recently... ) 'Anfield'. 'The Kop' is the end favoured by the home fans.
'Left-footed' has two meanings (in this context - it has an almost infinite variety of meanings as an insult [referring to religion, sexual orientation ...] in a wider context!) A player can be left-footed (the player's preference), but a kick can be left-footed as well. It simply means 'executed/performed/done by/with the left foot. It is used chiefly when it goes against the player's preference. "Beckham scored a brilliant left-footed goal" (as Beckham's a naturally right-footed player); similarly "Giggs scored a brilliant right-footed goal".