For most actions in the game, you need Action Points (AP). You have 3 available per turn. If you have AP from your previous turn at the beginning of your turn, they expire. Out of combat you can do as many Actions as you like, each AP takes 2 seconds.

• 1 AP: Move
  Move up to your Movement Rate, not diagonal.
• 2 AP: Attack
  Make a Melee or Ranged Attack against an enemy.
• 1 AP: Switch weapons
  Drawing or yielding costs no AP, but doing both does.
• 2 AP: Grapple
  Attempt to Grapple a target. Roll Body STR. Target has to roll Body to resist.
• 2 AP: Shove
  Attempt to Shove a target 2 sq away. Roll Body STR. Target has to roll Body to resist.
• 1 AP: Reposition
  Move up to 1 sq without provoking an Attack of Opportunity.
• 1 AP: Take cover
  Move up to 1 sq behind a cover.
• 1 AP: Get up
  If you are Prone, stand up.
• 1 AP: Use item or surroundings
  Pick up or use an item. Or use the environment like doors or levers.
• 0 AP: Free Actions
  Talking, dropping a weapon, drawing a weapon, some ability checks.
• Prepare an Action
  Ready an Action and specify when it should be executed.
• Class and Fighting Style Actions
  In addition to the actions above, you gain more actions throughout the game through your class and fighting style.