If you made it this far, congratulations! Thanks for sticking through this whole book with me. If you feel like it was a useful experience and you've learned a few things, please write a review on this book. That will help me improve the book in future editions. Let me know what I'm doing right and what I'm doing wrong, and it will help other prospective students understand if they should give this course a try. I'd really appreciate your feedback.

So where do you go from here? What's next? Well, there's obviously a lot more to learn. We've covered a lot of the basics of Spark, but of course there is more to the field of data science and big data as a whole. If you want more information on this topic, Packt offer an extensive collection of Spark books and courses. There are also some other books that I can recommend about Spark. I don't make any money from these, so don't worry, I'm not trying to sell you anything...