I'm an aperture priority person as well.
A great book to read at the beginning is Bryan Peterson's "Understanding Exposure," not to mention his book "Understanding Shutter Speed." You can also read an informative article written by him at Photo.net, which is basically a summation of everything in his books. Link: http://photo.net/learn/basic-photo-tips/aperture-shutterspeed-iso/
One time I generally go into manual mode is when I'm facing a backlighting situation that will result in the subject(s) being hard to see if I let the camera choose the shutter speed.
A great book to read at the beginning is Bryan Peterson's "Understanding Exposure," not to mention his book "Understanding Shutter Speed." You can also read an informative article written by him at Photo.net, which is basically a summation of everything in his books. Link: http://photo.net/learn/basic-photo-tips/aperture-shutterspeed-iso/
One time I generally go into manual mode is when I'm facing a backlighting situation that will result in the subject(s) being hard to see if I let the camera choose the shutter speed.