KDA refers to your kill, assist, and death ratio, XPM refers to the experience gained per minute, and GPM refers to the gold gained per minute.

Generally, the stronger the carry ability of a player, the better these three data points will be. And for some special heroes, how well you play them can be judged by your data. For example, with the Alchemist, a GPM below 800 is usually considered unacceptable. A normal carry player generally needs to maintain a GPM of over 600.