Minecraft wiki entry for Scoreboard, associated text: Criterion name Description Can be modified
dummy Score is only changed by commands, and not by game events such as death. This is useful for event flags, state mappings, currencies,... Yes
trigger Score is only changed by commands, and not by game events such as death. The /trigger command can be used by a player to set or increment/decrement their own score in an objective with this criterion. The /trigger command fails if the objective has not been "enabled" for the player using it, and the objective is disabled for the player after using the /trigger command on it. Note that the /trigger command can be used by ordinary players even if Cheats are off and they are not an Operator. This is useful for player input via /tellraw interfaces. Yes
deathCount Score increments automatically for a player when they die. Yes
playerKillCount Score increments automatically for a player when they kill another player. Yes
totalKillCount Score increments automatically for a player when they kill another player or a mob. Yes
health Ranges from 0 to 20 on a normal player; represents the amount of half-hearts the player has. May appear as 0 for players before their health has changed for the first time. Extra hearts and absorption hearts also count to the health score, meaning that with Attributes/Modifiers or the Health Boost or Absorption status effects, health can far surpass 20. No
xp Matches the total amount of experience the player has collected since their last death (or in other words, their score). No
level Matches the current experience level of the player. No
food Ranges from 0 to 20; represents the amount of hunger points the player has. May appear as 0 for players before their foodLevel has changed for the first time. No
air Ranges from 0 to 300; represents the amount of air the player has left from swimming under water, matches the air nbt tag of the player. No
armor Ranges from 0 to 20; represents the amount of armor points the player has. May appear as 0 for players before their armor has changed for the first time. No