Exploiting Opponents' Weaknesses

Jonny Vincent puts it well in this essay. Simply put,

"It all boils down to this: people either bet too much, call too much, or fold too much. It's your job to work out which one of these your opponent's are guilty of, and take advantage of their mistakes."

Unfortunately, he doesn't give too much info on how to individually deal with rocks, maniacs, and calling stations, and gives very broad advice:

"You absolutely must be able to determine the playing styles and quality of your opponents. After that, you can determine what strategies or adjustments to your play you need to make to beat them."

If anyone finds an article giving practical tips, please share.