"不知道⋯⋯好" (bù zhīdào... hǎo) is an expression used to indicate and emphasize that the speaker does not know how to do something, or at least does not know how to do something well.

Structure
"所有的... 都..." (suǒyǒu... dōu...) is a pattern used to refer to "every" or "all" of a noun, with the quantity of said noun usually being fairly large.
buzhidao

Examples
Suó yǒu de zì xínɡ chē dōu tài ɡuì.
所有 的 自行车 都 太 贵。
Subject+不知道+Verb Phrase+好
All of the bikes are too expensive.