1. Learning programming languages: Java, Python, Scala, etc. are commonly used programming languages in big data development, you can choose one or more of them to learn.

2. Learning databases: Hadoop, Spark and other big data processing frameworks require the use of databases, so you need to master the use of at least one database.

3. Learning Big Data Processing Frameworks: Hadoop, Spark, etc. are Big Data processing frameworks, you can choose one or more of them to learn.

4. Learning Machine Learning and Deep Learning: These technologies also have a wide range of applications in Big Data processing, you can choose one or more of them to learn.

5. Take a training course: if you want to master big data development skills faster, you can take some training courses, such as Coursera, Udacity, and other online courses.