A few fundamental truths I've tripped over along the path up the learning curve: 1. If the exposure reading is giving you a shutter speed that seems too good to be true for such a dim day, it’s because you forgot that you dialed in -2 EV to get that shot of the full moon last night. 2. If the bald eagle has held its pose during the period of time necessary to stop the car, roll down the window, set up the camera, un-set-up the camera, take the lens cap off, and re-set-up the camera, it means that the bird is habituated to motion. This, in turn, means that the momentary pause in activity as you try to frame the shot is enough to panic the bird and send it flying. 3. Downloading the memory card so that you don’t run out of storage during a shoot is counter-productive if you leave the card in the card reader. 4. At the moment that you finally figure out how to use every function on your camera, your camera will be old enough that it will need to be replaced rather than repaired. Others to add?