Putting is often called a game within a game, because many of the skills you need to be a good putter are different from those required for the rest of the game. What's more, studies show that putting accounts for 43% of the shots among better players. You'd be hard-pressed to find a great golfer who wasn't a good putter!
Given these facts, it makes sense for time-pressed golfers to invest time in their putting. Yet in my experience, most students ask for tips on everything but putting which has always amazed me. With a good understanding of the basic fundamentals and lots of practice, in my opinion anyone can putt like a pro!