PySpark is Python's library that is used by Spark. Below are some of the important points that can help you in learning Pyspark:
The first thing you must learn is Python/ Java/ Scala because these are the programming language used in Pyspark.
You must also know how to write different SQL queries. Because Spark works very closely with the SQL language.
If you want to become a Pyspark Developer, then watch the following video tutorial on it. This video tutorial will give you a basic idea of how to proceed further.