D3js Visualization

This pulls together the D3.js patterns you actually need for building interactive charts. It covers the selection and data binding fundamentals, then gives you working implementations of bar charts, line charts, and pie charts with proper margins and scales. The interactivity section is solid, showing how to add tooltips with proper positioning, smooth transitions, and zoom controls. What I like here is that it doesn't oversell D3's complexity. You get the core concepts like scaleLinear and scaleBand explained clearly, plus the join pattern for clean updates. The accessibility notes are brief but on point. Good reference when you need to spin up a visualization quickly without digging through the full D3 documentation.