Zant will use strategies from pervious Boss battles, which can be defeated essentially the same way. Just be sure to remember how you defeated the original Boss that he’s mimicking. Zant is easy but he moves erratically. Make sure to block his spin attack and do rolling attacks from behind to land more hits on him.
When fighting Zant in the Palace Of Twilight, remember the strategies from all the bosses you’ve already defeated. For example, like during the monkey fight in the Forest Temple, roll into the poles that Zant is on while he’s trying to shoot you. The best way to win during the sword fight is by using your hidden skills.