Being a former designer myself I would definitely recommend learning some WebGL in JavaScript. It's a lot easier for you to get familiar with JavaScript syntax and building stuff that you are already familiar with. (graphics!!)
I would recommend watching this video (The coding train) tutorial to learn about P5.js, a WebGL library; and this video (Fun Fun Function) for learning JavaScript in general.
Also checkout hackerrank, they have some pretty good tutorial too.
Happy hacking.