fire: button A
use and talk: button B
use spell: button Y
item menu: button X
status monitor: start button
fight: button A
download: button B
log out: button Y
Combat with scary ghouls: Shoot at them when they dig out of the ground, it saves time.
Combat with mages or gangers throwing powerballs/bombs: Keep next to your opponent, so he hurts himself with his wide range weapon.
Matrix: The Matrix is very easy when you have the right strategy Move field by field forward, until the status above tells you that IC is near you. Press the fight button. When the IC is in your walking direction, you get a message which tells you if your combat was successful or not. If not, try again. Remember the paths you took and go back on them. That's all you've got to know. When you stand in front of a white cube, press the download button. Easy?