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If you want to make it as a career choice, I think you should start with learning Java and Scala. For better or worse, this field is tied to the JVM and learning these languages will make picking up Spark and Hadoop (which tbh is a prereq for any Data Engineering position to have on their resume) a lot easier.

Also if you are looking to stay in the Python world, PySpark is pretty intuitive for any Python developer and tons of companies are using it.