For our May Maptime, we worked with Mapbox Studio, a powerful tool for designing global basemaps driven by vector tiles. Mapbox Studio allows you to style maps using a world of OpenStreetMap data provided, or use your own data. We went through the basics of the software, the CartoCSS styling language, and how to share maps.
We followed Mapbox Guides for much of this:
“Getting started” guides
CartoCSS and styling