in a nutshell means

شاعر الجنوب

In short

Tahya Fouad

To give the main points
Very briefly باختصار أو بإيجاز

Aziza Abdelwanis

1.Briefly
2. In short
3. To sum up
4. In summary
5. In brief
6. To put it simply
7. In a few words
8. In essence
9. To summarize
10. In a word