To be able to revise quickly and often, it helps if the information is terse and to the point highlighting only the important aspects. Something like an application cheat sheet or a poster that you can print and pin to a board or keep on your desk.
Get ready with the plotter or wide format printer, folks, these are some super handy cheat sheets for lots of software from the "Anatomy of a Linux System," to Photoshop. Love the one of Vi. I think I used to have this at one point. Don't even get me started on how I feel about using this fine piece of software from 1976. (sarcasm font)