Yan delivered an exceptional talk on Data Visualization at our MIT research centre, and we gained a tremendous amount of insight from his expertise!

His tools, workshops, and training resources are invaluable for anyone looking to enhance their data visualization skills, and we highly recommend exploring them.

I attended both of other Yan's courses, productive-r-workflow and matplotlib-journey, and they were excellent.

Clear, well-structured, and highly insightful. I highly recommend them and can't wait to follow this one too!

Yan has done an exceptional job to create an efficient course that still manages to help you understand how to approach creating custom visualization with D3.js while also keeping it fun 😄

This course has been one of the most helpful resources I've found for learning D3 with React.

Even though I sometimes had to refer to the solutions, the process taught me a lot. The balance between theory and practice is great, and I especially appreciate how the exercises build intuition rather than just memorization.

I attended a 2-day training with Yan on D3 and React.

Thanks to his attentiveness, he suggested an approach that was well suited to my skill level and business needs. Combining theory with (a lot of!) practice, he explains complex topics with great clarity.

I now have a solid foundation to continue learning, and I leave with many tips and directions to make my future work easier.

The React Graph Gallery has been an invaluable resource in my journey of learning interactive web-based data visualization.

The course is clear, concise, and straight to the point. The chart templates are simple, elegant, visually appealing, and are incredibly useful for quickly getting started with a given visualization.

I highly recommend it to anyone looking to elevate their data visualization skills!

Yan is genuinely one of the best teachers I've come across for data viz. The React + D3 course is structured really well, with bite-sized lessons that actually build on each other.

I'm halfway through and already have real projects to show. The community aspect makes it even better. Highly recommend.

I loove the course so much so far 😭😭😭 Everything is so nicely explained, parts I struggled to understand fall just into the right place. I feel actually guided and empowered to learn 🥹

And the text is so well-written and so human in this era of AI! Thank you for that, maybe my excitement is too early, but right now this course feels like a true gem.

I was really excited to join the D3 loves React course and learn first-hand from a great DataViz designer like Yan. And the course fully met my expectations: great content, a clear course structure, comprehensive sandboxed lessons, and engaging practice projects that made me actually create something from scratch on my machine and publish it to GitHub, a real-world learning experience that many courses lack.

And if there is ever a problem during the course journey, Yan is very present and there to support.

I was up until 1am last night because I was having such a good time tweaking and learning the ins and outs of React. Thanks Yan for putting this course together and I'm excited to keep learning!!

I like how practical it is and appreciate all the support you give to the students.

I'm someone who tried to learn D3 in the past and gave it up 🙈. Your course is different league 😉

I love it!

I can't believe how much I've learned already and it's been very satisfying. It's like finally having a door to a world I didn't know how to get into.

The format is perfect, very smart, on point. Thanks again for putting it together!

Highly recommended. The course is going beyond a learning experience. Yan provides the right dose of theory and practice for learning not only the fundamentals but also the advanced concepts.

From the beginning you are able to put into practice what you learn and start building stunning stuff, increasing your engagement with the course. All this accompanied with a very collaborative framework where other students and Yan himself keep very helpful and responsive.

The course is absolutely amazing!!! I love it! 😻 One of the best courses I've taken! It was exactly what I was hoping for and there is so much to learn and endless design possibilities. 🙂

I'm applying the things I've learnt on a personal project. It's so much fun. Yesterday I was sitting on the computer the whole day until midnight 😅 Time flies!

Thank you so much for building this course and sharing your knowledge. ❤️. It opened a new world for me!

I've followed Yan's posts about data viz for years. I knew he had courses on data viz using R and Python but early in 2026 I noticed he had created a course using D3 combined with React for data viz. I'd been trying to learn D3 properly for years after having used other libraries like DC.js with some small success. I never really felt like I could successfully build anything with D3. Then I started Yan's course…

The course begins with a great overview of the fundamental technology of web development and React. If you've never seen any of this before it could be a steep learning curve but Yan has created dozens of small quizzes to help embed the learning from each section.

You'll then work through different sections, each culminating in a mini assignment to build a particular data viz. It's a great way to see yourself actually building something tangible. Part of my struggle in the past has been crippling procrastination, but I found that these smaller exercises and assignments made it easier to push through that and get to a point where I understood enough to get something built.

I still have lots to learn, but one of the great things about this course is that you have access to the materials forever after you enrol.

This is, without a doubt, the best course on D3 that I've ever completed and I thoroughly recommend it to anyone who wants to learn D3.

Yan Holtz has created an amazing online D3 course that I'm following right now. Besides the super easy-to-follow lessons, there's also a Discord community so you don't feel lonely during the process, plus Yan is incredibly proactive about answering questions and hosts two live Q&As every Friday.

Lately, I've been exploring D3 and React through Yan Holtz's course, and I'm enjoying it a lot. It's very well-structured and carefully thought through, which has already given us a solid high-level understanding of how web creation works and how things are built.

The course D3 ♥️ React is what I would wish from an online programming course: well-structured, very applied, with feedback and community.

The possibility to access the course flexibly and life-long was a clear advantage for me as a working professional and a busy parent. One more point for me to choose it was that the certificate of completion is provided.

I enjoy building something real, and Yan's knowledge and expertise enable this.

This course has a rare quality: it makes you curious. It has opened my eyes to what is possible.

I came in knowing nothing about D3.JS and React, and while I'm still working through the material, I already find myself being less afraid and more confident in taking my visuals to the next level. Yan does a terrific job of demystifying the magic behind the visuals that seemed beyond my reach before taking this course.

I have tried to learn D3 for years, with limited success. Browsing the D3 and Observable documentation never really clicked with me, and I always found it a bit confusing, until I found the D3 ❤️ React course.

This course takes you from fundamentals to building stunning web based data visualisations in no time. Not only do you get to grips with D3, but you are also presented with a tech stack built for the modern age. I strongly recommend this course to anyone interested in D3 and modern web app development!

I'm really happy about both the quantity and quality of the whole course. It's clear that Yan knows what he is talking about (and he is always there to help). It is truly worth the price!

This course is a true investment. It took me from zero knowledge, to understanding all key elements I need to build the kind of interactive data visualizations I envision, with the confidence that I know what I (and an AI) am doing.