[Question] What are some skills useful for EA that one could learn in ~6 months?

I’ve got a fair bit of free time for the next few months and I’d like to try learn something useful. For example, I’ve noticed some jobs and volunteer opportunities being posted in EA circles for web developers. It seems like one could potentially gain a usable understanding of web dev in about 6 months (although I may be very wrong about this). I’d welcome any suggestions, whether the skills are technical or more ‘soft’.