Speak English(read and write it too)fluently. Speak some Spanish too. J/K. Seriously, in the early 90's I taught myself HTML(1-3)and some JS(1-1.2). I dabbled with CSS(1), Java(the early stuff)and the defunct Jscript. Currently updated to HTML5. Relearning CSS(3).
I'm learning CSS3. From there it's onto JS(the current version-industry standard). After that I want to learn MongoDB, Express.js, React(js?) and Node.js(basically want to learn the MERN Stack)
projects and hacks
Most of my projects(in infancy)will be on https://github.com/Prince-Alarming .
Input for some guidance for which stack to learn(MERN or MEAN, leaning towards MERN).