Turns in Last Light are played simultaneously. Only the Command action card must be resolved in player order, beginning with the player holding the first player token and proceeding clockwise.
Each round, players simultaneously choose a single action card to play then take the action(s) on that card. Your played action cards stay on the table until you play your Refresh card. Refresh cards stay on the table until all players have played their Refresh.
After the last Refresh has been played, and all players have finished their actions, each player takes their Refresh card back and the board is rotated according to the end of round instructions.
Each action card has a unique effect. Though most actions can be resolved simultaneously, if there is ever a conflict with regards to the timing resolution of actions or technologies, the player with the lower number on their played action card resolves theirs first. If the conflict occurs between players who both played the same action card, resolve beginning with the player holding the first player token and proceeding clockwise.
NOTE: Players always get an action. If—at the start of a round—you have no action cards in your hand, pick up all your action cards except Refresh.