[brc]

Sales. Learn to sell something. If you're taking time off, why not consider doing phone cold calling for a charity. This is particularly brutal but probably a sharp, free course in improving your sales and cold calling skills.

Everyone needs sales skills, whether it is to understand why people buy, or just to 'sell' ideas, whether pitching to investors or convincing a partner/superior or team to implement your idea.

[kenny-log_ins]

On this note, design and web skills. Whatever you do, its useful to be able to make it look good. If you are working with people who aren't savvy with web tech then it is very useful to be able to knock good looking sites up quickly and will impress easily. learn how to use bootstrap templates to generate simple nice looking web pages. also bonus points for learning basic graphic design skills so you can generate your own images to customise your pages further.

[roel_v]

But only after doing a few day course in how to cold call, so that you can write/tweak your own scripts, and/or know why the ones they give you are the way they are.

Also, doing various sorts of hard selling (phone, on the street, for charity or selling products) would probably teach more than doing charity sales for 2 months. I'm too chicken to do something like this myself though...