In a nutshell

In a very short and simple way, using few words.

Examples

In a nutshell, the project is late and over budget.
Can you explain the plan in a nutshell? I only have five minutes.

How to use it

Neutral. Often at the start of a sentence, or "put it in a nutshell".

long story shortUsed before giving a quick summary instead of all the details.
cut to the chaseTo get to the most important point without wasting time on details.