Nathan Yau provides a great summary of resources for improving your data visualization skills in this post on Flowing Data.
- Read the classics of Edward Tufte, like the Visual Display of Quantitative Information and others (including Yau’s excellent books)
- Gather data
- Do visualizations
- Share visualizations and get feedback
- Go back to your readings and start again
Yau’s post is titled Getting started with visualization after getting started with visualization – and points to iterative aspects of learning by reading, doing, sharing, doing again.