请分析段落中句子的并列层级The goal here is simple Explain what a derivative is Thing is though there’s some subtlety to this topic and some potential for paradoxes if you’re not careful so the secondary goal is th

该段落中有两个并列句子，第一个句子为"The goal here is simple: Explain what a derivative is."，第二个句子为"Thing is, though, there’s some subtlety to this topic, and some potential for paradoxes if you’re not careful, so the secondary goal is that you have some appreciation for what those paradoxes are and how to avoid them."。这两个句子通过逗号连接，并列关系明显。