1. Take photos early morning or night as there as less shadows
2. Always make sure your battery is recharged (or you have spare batteries) so your camera doesn't suddenly die on you at the worst possible moment
3. Get closer - if you can't get closer zoom in further, if you can't zoom in get closer
4. Learn to use the histogram to adjust settings and get a good exposure.
5. take the lens cap off doofus!
6. Check that your camera is not set to auto ISO,(unless you definitely want it to be) learned this the hard way.... as have many others, I expect.
7. Starting guide for obtaining a proper exposure of a full moon is to the aperture at f/11 and shutter speed at one over the ISO setting (eg. 1/125 for ISO 100). For pictures of a half moon, use the same shutter speed at f/8. For a quarter moon, f/5.6.
8. Lenses and cameras never used to have anti-shake systems built into them. As shutter speeds got slower, camera shake was likely to blur your image, and you had to know what you could safely get away with! As a rule-of-thumb, the slowest shutter speed at which you could safely handhold a camera was usually considered to be one over the focal length of the lens. So, if you're using a 50mm lens, you could generally shoot at 1/60 sec or faster. A 100mm lens needed at least 1/125 sec; 1/300 for 300mm and so forth. Not enough light to do that? Then you had to use flash, a tripod, or brace your camera (and yourself) against a solid object.
9. The classic advice is, "Expose for the highlights and let the shadows take care of themselves." This works with slide film and digital. But with negative film, especially colour negative film, you're actually better off overexposing by one stop.
10. To stop action moving across the frame that's perpendicular to the lens axis, you need shutter speeds two stops faster than action moving toward or away from you. For action moving at a 45-degree angle to the lens axis, you can use a shutter speed one stop slower. For example: If a person running toward you at moderate speed can be stopped at 1/125 sec, you'll need a shutter speed of 1/500 sec to stop the subject moving across the frame, and a shutter speed of 1/250 sec to stop him if moving obliquely with respect to the camera.
11. Before you ask the question - READ THE MANUAL!!
12. Learn and understand "depth of field"
13. When taking your camera out for the first time since a previous shoot verify all your settings are what you want for this new shoot so you don't use the previous shoot settings which may be wildly inappropriate.
14. dont be afraid of a little fill flash to expose shadowed areas.
15. Learn and understand the interrelationship between shutter speed, aperture and ISO.
16. Make sure the camera is on when you go to take a shot
17. When at a famous landmark, look for the angle you've never seen in another photo before
18. Get down to children's height to take photo
19. Know your equipment - to the point where it becomes second nature. The less you have to muck around in menus and think about settings, the more time you can spend on the much more important aspects of timing, lighting and composition. You will always be wanting a new lens, a new body etc - working with what you have will force you to be more creative.
20. Start shooting raw and learn about white balance
21. Learn to use exposure compensation (Ev) and handle the highlights better
22. Keep it simple, in photography less equals more.
23. Always put your camera on full auto when storing it, travelling etc. You never know when a great shot might present itself, and in Auto you can grab the camera and get the shot off. That elusive shot of a Yeti, will be just a blur if you still had it set to 10 second shutter speed from the night landscapes from yesterday.
24. For portraits of children always spot focus right between the eyes