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Data cleansing is one of the most important skills in analytics—but ironically, it’s the least glamorous. Most datasets in real companies are messy, incomplete, duplicated, or inconsistent. Before you can build dashboards, run models, or produce insights, you must first clean the data. Fill out the form below to get your free download now!

Learn how clean data leads to accurate analysis and informed decision-making.

Discover how to remove duplicates and inconsistencies for a more efficient data workflow.

Enhance the reliability of your analytics by ensuring your data is accurate and consistent.

Explore the Power of Data Cleansing

Discover the essential skill of data cleansing with our free ebook. Learn how to tackle messy datasets, optimize your data workflow, and unleash the full potential of your analytics projects. Get ready to transform raw information into reliable, decision-ready insights.

Meet Your Trainer: The Jellyman

Jed Guinto is a data analyst and founder of Jellyman Education, helping thousands learn Tableau, SQL, and analytics through clear, practical teaching. After rebuilding his career from scratch, he now empowers others to gain confidence, create opportunity, and break into data with real-world skills.

What People Are Saying

Discover how our ebook is helping individuals like you unlock the power of clean data and enhance their analytical capabilities.

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Jed does an awesome job explaining all of the small details that some might just browse over. Everything was EXTREMELY EASY to follow, especially since I had ZERO EXPERIENCE in Tableau before this. I feel much better about jumping into the program and I have a much better footing when it comes to simple reports. Tableau seems much LESS INTIMIDATING now that I've completed Jed's course. Thank you, Jed! I also loved your jokes along the way. It's very clear how passionate you are about Tableau. Your efforts are greatly appreciated!

Tierney W.

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tutor is so fun, catches my attention, makes the thing easier to learn

Wenyu L.

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Great course to get started as a beginner. Highly recommend and it is free! The creator is far from monotone and is very comical throughout the 2 hour course.

Triston B.

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If you are considering developing data visualization skills or if you are considering using Tableau as your data visualization software, this is the course for you. I consider this class to be a great survey course that provides you with basic skills plus an understanding of what more is possible. You won't finish this course as a Tableau expert (that is not the purpose of the course), but you will be well prepared for what's next. The instructor is excellent. The pace is exactly right. The content and examples are very helpful. Highly recommended!

Paul M.

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I love the way he simply show things and explain them! I easily can follow his instructor and do my practice with him at the same time. Great instructor. I wanted to buy his other course for the Complete Tableau but it is really pricey and couldn't effort it.

Shazad C.

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Jed does an awesome job explaining all of the small details that some might just browse over. Everything was EXTREMELY EASY to follow, especially since I had ZERO EXPERIENCE in Tableau before this. I feel much better about jumping into the program and I have a much better footing when it comes to simple reports. Tableau seems much LESS INTIMIDATING now that I've completed Jed's course. Thank you, Jed! I also loved your jokes along the way. It's very clear how passionate you are about Tableau. Your efforts are greatly appreciated!