Should you be using Auto Iso
The very simple answer is yes - you should!
Like most of these things its about using it at the right times and then being able to turn it off at the right time. In simple terms auto ISO ensures that you always get the minimum shutter speed you want by changing the ISO setting accordingly. What this means is you can shoot hand held confident that as the lighting conditions change you camera will manage the ISO setting to ensure you always get your minimum defined speed setting. Do I use it - Yes 90% of the time and it is a feature that has never let me down.
How you set up this feature and what you can setup differs from one camera manufacturer to another
NIKON
CANON
OLYMPUS
FUJI
SUMMARY
Develop your style
Take the images you like Be the photographer you want to be