✚ Visualization Tools and Learning Resources, September 2021 Roundup

<img width=“750” height=“420” src=“https://flowingdata.com/wp-content/uploads/2021/09/process-158-featured-1-750x420.png" class=“attachment-medium size-medium wp-post-image” alt=“” loading=“lazy” srcset=“https://flowingdata.com/wp-content/uploads/2021/09/process-158-featured-1-750x420.png 750w, https://flowingdata.com/wp-content/uploads/2021/09/process-158-featured-1-1090x610.png 1090w, https://flowingdata.com/wp-content/uploads/2021/09/process-158-featured-1-210x118.png 210w, https://flowingdata.com/wp-content/uploads/2021/0 …