Acronyms, which are words or names formed as abbreviating from initial letters of words, have been used to convey useful information, when they are not being abused by bureacrats and middle management types to create confusing words.
There are just so many kinds and usage of acronyms, but we shall limit ourselves with the nicer acronyms, which help us remember important concepts about certain skills, such as writing, sales etc.
There is also this list of 100 most useful acronyms on Bighow, which is the home for earlier versions of The Success Manual.