Mexican living in Belgium, going to Tunis for work. What to expect?

As the title says, I'm an IT Engineer, working for a Belgian company, and I'm going to spend a week in your beautiful capital.

I am originally from Mexico City, so a little bit of chaos is normal for me, but this would be my first time in North Africa.

I am seeing many posts and videos about how beautiful Tunisia is. And most of the comments from travellers I find, they praise the kindness of people and the delicious food.

So I come here to your subreddit asking for advice/suggestions

- What food/dish do I absolutely must try?
- Suppose I'll have some free hours in the afternoon, evening, What can I visit in Tunis?
- What do I need to avoid at all costs? Or do?
- How to say the most basic phrases (How do you do?, Thank you, Please)

Thanks !