Explanation on what can go wrong if Hooks were called inside loops or nested functions?

The Rules of Hooks section states that the first rule of Hooks is to only call hooks at the top level, i.e. "Don’t call Hooks inside loops, conditions, or nested functions". Later in the section, it explains what happens if we put a Hook call inside a condition. This still leaves me with some questions/doubts though. Are there examples where something can go wrong if Hooks were:

• called inside a loop?
• called inside a nested function? Furthermore, isn't a custom hook just a nested function? 🤔

I've tried to dig into some related questions on Stack Overflow here and here, but the answers provided only give the correct examples, but not the incorrect ones.

Could you provide incorrect examples for the other two cases? Or at least a little bit clarification would be most appreciated. :)

从 Rules of Hooks 部分开始，尤其是现有的关于有条件调用 Hook 的说明。添加涵盖循环和嵌套函数中的 Hooks 的错误示例或澄清，包括 custom Hooks 有何不同，并在文档清楚解释这些情况后将工作视为完成。