If you don't know than that short sentence is French for saying "how are you?". Most people find learning French is more challenging compared to many other languages that people are becoming more interested in learning today. They reason that French is challenging compared to Spanish, German and Italian is because it has a completely unique way of pronunciation. I don't really think so. I think its more about getting into that mode. Like the shape you make with your lips define sound you are going to utter when you speak the alphabet 'Q' in French. Problem is that most people are not ready to make that effort to watch carefully the movement of lips and make sound accordingly. If you do that you will find it really easy to hit.
Another point to note is that when responding to French questions, you'll need to know the correct intonation. Much of the time, the rising tone is only applicable for simple yes or no questions, with other things or simple conversational patterns, the intonation is placed at the end of the sentence. But again, once you have stayed there for even a week and if you follow the native speaking style closely, this should be no issue. I don't want to sound advertising but yeah this Rocket French, helped a lot. I had prepared myself to the audio clips they provided of the local sound. I even asked my friend to help me by making similar lip movements while I tried to read them. It helps! You can find the course here -Rocket French. Definitely my topmost recommendation.