Players alternate moving and fighting with their units. So, one player will move and fight with their forces first, and then the opponent will move and fight. This process is then repeated, with the first player moving and fighting again, and so on until the game is done.
During their turn, a player can usually move and fight will of all of their units. For convenience and flow of game play, we divide a player's turn into four main phases:
This means you move any models you want first, then cast spells, then shoot and finally resolve any close combats. This process helps to keep track of what is going on and makes it easier to know when one player's actions are over and the opponent can start their turn.