I am new to D3 drawing and data manipulation but I have a project where I need to draw this map with D3js and I need to colorize the countries based on my data. For example: I have to draw the world map based on McDonalds branches on every country. So U.S would be colored darker, France a bit lighter, some place with no McDonald should be all white. Do you know any template or website where I can learn or use this example? I have tried looking at bl.ocks.org but there was some more complexed projects than my skills right now. Thank you in advance.