Golf Handicaps.

I just don't understand it from the definitions I've read online. 
A golf handicap is often determined at the course where a golfer typically plays, and though certain details of a handicap system may vary, handicaps are generally based on a recent history of a golfer's rounds [1]. A handicap of course indicates the number of strokes that a golfer receives at a particular golf course [3]. It can be thought of as an adjustment to a golfer's handicap that takes the difficulty of a golf course into account [3]. The number of strokes that should be deducted from a golfer [3].
In an effort to more accurately represent a player's scores, an adjustment, referred to as the Playing Conditions Calculation (PCC), based on playing conditions for the course is included [4]. This involves factoring in a number, ranging from -1 (when conditions make the course easier) to 3 (when conditions make the course more difficult), into the score differential calculation, depending on the conditions of the course for the given day [4]. Given a day with relatively better weather conditions, the player's score would likely have been better, and the score will be automatically adjusted using statistical procedures to more accurately reflect these conditions [4].
The golf handicap system was created by the United States Golf Association and allows golfers of all abilities to compete against each other fairly [1].  It is a numerical measurement that will enable you to track any improvements in skill level [1]. A golf handicap index is calculated using a formula that takes your adjusted score (which is when you first set up your handicap, triple bogey is the maximum on each hole) and subtracts the course rating [4]. That figure is then multiplied by 113 (which represents the slope rating of a course of average difficulty) and divided by the actual course rating for the selected set of tees [4]. The reason that this system is tried and tested amongst golfers is that it can accurately compute the total number of strokes [3].