91-DIVOC (http://www.91-divoc.com/pages/covid-visualization/), the best way to monitor on a log scale. Looking at NY and CA on the US State-level data and switching between log and linear is a great way to build intuition about the math of flattening the curve.
Our World in Data (https://ourworldindata.org/coronavirus), which has a lengthy and informative explanation of the limits of what we can infer from the data we have.