The best ROI I find in programming, or dealing with computers in general, lies in learning shortcuts.<p>Ctrl-V Ctrl-C takes a couple seconds to learn, and saves you hours or days of clicking around, copying, and then pasting. Same with learning emacs or vim.<p>Learn them once and you're set for life.<p>What are some of the best ROIS in life, aside from the obvious (learning personal finance, working out and nutrition, or basic arithmetic) ?