Resources to do choropleth map and the treemap

I am stuck in the choropleth map and treemap projects of Data Visualization because I haven’t found proper resources of how to do them.
Some one know good tutorials and/or courses about that.

I am afraid there are no beginner-friendly (at least i have not come across one) tutorials for d3.js . I suggest you read their documentation Here and look at the code for the examples given in

Besides being difficult to pick up, there are a few resources to learn d3.js(Still wondering why) and even the available ones are for former major versions of d3.js .