a different kettle of fish

A different kettle meaning: to be completely different from someone or something else that has already been spoken about
مثال: Reading a story and writing one is a different kettle of fish

با چیزی که قبلا گفته شد کاملا فرق داشتن

یه چیز دیگست - یه چیز کاملا متفاوت
Having knowledge is one thing, but being able to communicate it to others is another kettle of fish