Frequently Asked Questions

Which course should I take first?

All of our courses are designed to stand alone; there is no sequence in which you must take them. If you’re getting started in machine learning, Machine Learning, Data Science and Deep Learning with Python is a good place to start. If you’re more interested in big data, you might start with The Ultimate Hands-On Hadoop: Tame your Big Data.

If you’re interested in AWS certification, we offer both video courses and practice exams for the Data Analytics and Machine Learning Specialty exams. You’ll probably want the practice exams after taking the associated course.

Which Spark course should I take?

First, decide if you’re more comfortable with the Python or Scala programming language. There are two introductory courses that are similar, but one uses Python, and the other uses Scala. Spark works better with Scala.

The Python-based course is Taming Big Data with Apache Spark and Python, and the Scala-based course is Apache Spark 3 with Scala.

Once you’ve completed one of those courses, you may want to dive deeper with Spark Streaming by taking Streaming Big Data with Spark Streaming, Scala, and Spark 3.

Where do I get the course materials from?

Generally one of the first video lectures in the course you have purchased will walk you through how to set up the software you need, and how to obtain the code associated with the course.

How can I get my questions about the course answered?

Just post a comment on the lecture you have a question about, and we’ll see it! You might also check out the “community” menu for a place where you can talk with your fellow students.

Please keep in mind we can only answer questions about the course itself. We can’t offer free advice and consulting on your projects outside of the course.

I’m having a problem with the site; how can I let you know?

Send an email to and we’ll look into it right away!

What is your refund policy?

All sales are final, as stated in our terms of service. We encourage you to check out the free lectures on each course, and our free trial course on deep learning to make sure our platform and teaching style works for you before you purchase. Subscriptions of course may be cancelled at any time.

How do I cancel my membership plan?

If you’ve finished your learning with us, just log into your account from our home page or use the “My Courses / Log In” menu option on our site. From there, select “My Subscriptions,” and you may cancel your membership there.

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