Antistrophe is like playing a game of "follow-the-leader" with words. Imagine you and your friends are playing. When it's your turn to be the leader, you say something like "I like ice cream." Then, when it's your friend's turn to lead, they have to say something that goes with what you said. So they might say "Ice cream is sweet." That's what we call antistrophe!
In poetry, it's similar. The first line, or "stanza," might say something like "The sun is shining bright today," and then the second line will repeat the same idea but with different words, like "Today is filled with sunshine's way." This back-and-forth pattern can be used to create some really cool effects in poetry. It's kind of like a conversation between the poem and the reader.