Help with the Fourth Certificate and D3.js

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Here is a course reviewed here on fcc:

Free D3 course from beginner to expert

Hi, After almost finishing all of my d3 projects and challenges, I just wanted to share this amazing course by Curran Kelleher. It’s a very complete course on how to create from simple d3 data visualizations to complex ones. Plus, Curran takes the time to explain each topic thoughtfully. Ps: I’m not being paid to promote this but personally, this is the only course I’ve taken that has given me a good grasp of d3. I would suggest to try it before doing the challenges and of course the project…

Here an in-depth resource:

Create With Data

I suggest you to keep doing minimal stuff unless you can grasp correctly the basics ( i.e. enter-exit-update )^^
Good luck!