Condition 1: full mag, round chambered, cocked and locked
Condition 2: full mag, round chambered, uncocked (hammer down)
Condition 3: full mag, chamber empty, usually uncocked
Condition 4: gun is unloaded (empty)
Condition 0: full mag, round chambered, cocked and unlocked (safety off)
The above is usually in reference to 1911 style pistols. Conditions 0-3 would also apply if the mag was NOT full (one or more rounds in magazine). For Condition 3, the slide must be racked before shooting. Some shooters cock the hammer because it is easier to rack the slide.
I always carry Condition 1.
I would NEVER carry Condition 2. I have, on rare occasions, carried Condition 3 but that was a loooong time ago.
And what's the point of carrying in Conditions 0 and 4?
Just my personal choice. You may have a personal choice of your own.
Hope this was what you were looking for. Best regards,
tawakoni