"Let's park that and circle back once we've got a ballpark."
Every word in that sentence is simple. Together, they mean something none of them mean apart - and nobody has ever explained it to you. Your English is good. Your grammar is fine. But workplaces run on a dialect that no course teaches: phrasal verbs, half-idioms, email phrases that mean the opposite of what they say, and the small signals that decide whether a message reads as friendly or furious.
WHO IT'S FOR
Professionals who already speak English well and are tired of being asked to repeat themselves. If you can read this description comfortably, your English is not the problem - and this book will not waste your time on grammar you already know.