French phrase
Le point essentiel est que ~.
Meaning
The key point is that ___.
When to use it
It states what matters most. It is common in formal explanations and has a clear, slightly formal tone.
Example dialogue
Le point essentiel est que vous remettiez le dossier à temps.
The key point is that you submit the file on time.
D'accord, je le ferai.
Okay, I will.