When you roll initiative, you divide that by 10, rounding up (ie. You roll a 17 and you get 2, you roll a 22 and you get 3). This is how many action you get in a turn, minimum of 2. A borg with a REF 15 and a Combat Sense of 10 starts off with 3 actions minium. You may only perform 1 type of action in a given round (example, you've got 3 actions, so you can dodge, move and fire a weapon in the round.) When you take multiple actions there is still the -3 for the second, -6 for the third, -9 for the fourth, etc. The types of action are divided into sections, MOVE and SKILL. MOVE means you aren't really concentrating on how it's done. SKILL is when you are taking great care into what you are doing (like firing a weapon to hit a person). Here are types of actions that you may take in a round:

MOVE:

Move your MA (player may move their full MA; This may only be use once/turn)
Dodge (player dodges attacks and seeks closest cover)
Suppressive Fire (player fires automatic weapon into an area)
Run (player uses their full RUN; This takes 2 actions to do)
Drop Prone (player throws themself to the ground)
Drop Object (player drops whatever they're holding)
Draw weapon (player readies their weapon for attack)

SKILL:

Melee, Hand to Hand, Firearm Attack (player may make an attack. This can only be performed once/turn)
Aim (this takes 2 action to do, and gives a -1 to-hit/2 actions. Player must stand still while performing this action.)
Acrobatic Feat (player makes a leap, does a somersault, or does something other than running, but requires a skill check.)
Multiple Targets (player may attack multiple targets. There is a limit to how many. For firearms it is limited to fire rate of weapon. Targets all must be in the smae 90-degree arc. If they're not, then the player must use another action to face the target. For Hand-to-Hand it's limited to three {punch, punch, kick}. For Melee you're limited to three. Each attack is consider an action. So you shoot one guy first action, you shoot the second guy at a -3 to-hit, and a third at -6, etc.)
Parry (player uses an object to parry an attack. Parry last for the whole turn. They also have a -1 penalty/attack made against them. So if five opponents attack the player, on the first attack it's normal, on the second attack -1, third -2, etc.)
Move/Attack (player may move ½ their MA and fire their weapon as one action.)
Remove Magazine (player removes an empty magazine or charge. NOTE: you must do this action before you can use the Reload action.)
Reload Weapon (player reloads a weapon. NOTE: you must Remove Magazine before you can use the Reload action.)
Quickdraw (player draws their weapons and fires as one action.)
Full Auto (can only be used with a fully automatic weapon. It requires 2 actions to do. Player fires as per Cyberpunk 2020 rules.)
Use an Item (depending on the complexity of the item, it may require more than one action. Referee's call.)
Requires a Skill Roll (like Library Search or Medtech. The Referee may choose how many actions are required.)
Stand Up (stand up if player was prone.)
Change Facing (player can change their facing up to a 180 degrees in one action.)