The first rule of Fight Club is you do not talk about Fight Club. Likewise, the first rule of photography should be that there are no rules. The problem is, all those rules and regulations we've learned regarding composition and f-stops and shutter speeds do make perfect sense as a starting point.
A friend of mine just gave me the best advice I've heard in a long time: use AA batteries. Sounds simple, but he meant to get rid of my heavy battery packs that give my flash short recycle times and lots of flashes with every charge.
Q) When I bump up the ISO setting in my camera, am I changing its sensitivity? If it does, couldn't I just leave it there and adjust my aperture or shutter speed?