What do you know about the main branches of the Arab economy?

The tribes of the Arabs are mentioned in the works of ancient authors.

The Arabs were a nomadic people, their troops often raided their settled neighbors and on the territory of neighboring states. Fighting them was difficult, since the Arabs had light cavalry that were difficult to compete with.

The Arabs were engaged in cattle breeding, wandering from place to place. Some Arab tribes led a sedentary lifestyle, engaged in agriculture and trade. The settlements of the Arabs along the trade routes quickly grew rich.