If you learn nothing else in Arabic, learn the greetings. Really. I mean it. A few confident openings will do more for you, in a restaurant in Tripoli or a meeting in Doha, than a textbook of grammar ever will. They tell the person in front of you that you have bothered. That alone is often enough. Below are the five I would start with, in the order I would teach them.
1. Salam (or السلام عليكم)
The classic. السلام عليكم (as-salamu alaykum, peace be upon you) is the most widely recognised greeting across the Arab world. You will hear it between Muslims as a religious greeting, but in many countries it has become a universal hello, used by Christians, Druze, non-religious people, everyone. The reply is و عليكم السلام (wa alaykum as-salam, and upon you peace).
Short form: Salam. This works everywhere, is warm without being heavy, and you can nod it at a shopkeeper, say it as you enter a room, or begin an email with it. If you are worried about religious overtones, use this short form. It lands lightly.
2. Ahlan (أهلاً)
My favourite. It comes from the word for family, ahl, and the spirit behind it is you are welcome here, you are one of us. Use it when someone arrives, when someone sits down, when you open your door. People often pair it with a second word, ahlan wa sahlan (أهلاً وسهلاً), which doubles the warmth and roughly means welcome and at ease. If somebody says ahlan to you, you can simply return it. Ahlan beek (to a man), ahlan beeki (to a woman). That is the version I use at the start of every lesson.
3. Marhaba (مرحبا)
A soft, neutral hello. Marhaba (welcome, hello) is lighter than salam and more casual than ahlan. It is the one I would use walking into a shop or calling a taxi. The reply is marhabtayn, which literally means two hellos. Quietly generous, that one. If you are not sure which greeting suits a situation, marhaba almost never feels wrong.
"A few confident openings will do more for you than a textbook of grammar ever will."
4. Sabah al-khair (صباح الخير)
Good morning. Literally morning of goodness. You use it any time before about one in the afternoon, and the reply is the one that makes people smile, because there are so many of them. Sabah al-noor, morning of light. Sabah al-ward, morning of roses. Sabah al-full, morning of jasmine. The more poetic the reply, the warmer the relationship. I once had a greengrocer on Hamra Street who greeted me every day for a year with sabah al-ful wal-yasmin, morning of jasmine and the sweet flower. You can build an entire friendship on a good morning greeting.
5. Masa al-khair (مساء الخير)
Good evening, which works from the early afternoon through late at night. The reply is masa al-noor, evening of light. It has the same warmth as sabah al-khair but feels slightly quieter, more end-of-day. I like that Arabic splits the day in two this way. You are not obliged to know the time to the minute. You are simply acknowledging whether the sun is climbing or falling.
A short note on what happens after
The greeting itself is only the doorway. After it, an Arabic exchange is often a quick flurry of how are you (kif halak for a man, kif halik for a woman), how is the family (kif al-ahel), and thanks be to God (al-hamdu lillah) as the standard answer regardless of how you actually are. You do not have to master all of that on day one. Starting with one good greeting, delivered with a smile, is already most of the work. Everything else follows.
Try one today. If you know an Arabic speaker, say ahlan when they arrive. Watch their face. That small moment is what I love about teaching this language. It is almost absurdly easy to make someone's day, and the greetings are where it begins.
If you want help with pronunciation, or you want to learn the greetings in a specific dialect (Levantine, Egyptian, Gulf), that is what the free thirty-minute taster is for. Book a taster and we can walk through them together.