1. Hadoop big data development direction Strong market demand, the main body of big data training, the current focus of IT training institutions. Corresponding positions: big data development engineers, crawler engineers, data analysts and so on. 2. data mining, data analysis & machine learning direction High starting point for learning, difficult, only a few training organizations in the market. Corresponding positions: data scientists, data mining engineers, machine learning engineers and so on. 3. big data operation and maintenance & cloud computing direction Market demand is medium, more inclined to Linux, cloud computing discipline. Corresponding position: big data operation and maintenance engineer. Anyone who is proficient in any of these directions will have a great future.