Putting Charts provides information to help golfers read putts on sloping greens. Depending on your preference, it can provide aim point and apex breaks that can be adjusted for specific green and putt conditions. It also supports the widely used technique for estimating break offset by holding up a number of fingers. 
For putts inside 15ft, those with a higher make percentage, reading the break accurately improves the chances of making the putt. With practice, the green slope can usually be estimated by sight or with foot pressure, and Putting Charts can then provide the break with reasonable accuracy. Using putting charts improves your chances of making critical short putts.
Putting charts simply provides charts that can be used to help predict break and aiming, after estimating slopes on the putting line, while playing golf.