1. Shoot in manual. When you take photos in Auto, the camera is making all the choices for you and
2. Get a better lens. When I was reading reviews on Amazon for the camera that I eventually purchased, one review said that you should just throw away the kit lens because it was junk. At the time, I thought that had to be an exaggeration! After purchasing my first lens, the nifty fifty, I realized that commenter was 100% right. Every image I've taken with the nifty fifty is very sharp. If you want to improve your photography, I highly recommend the 50mm lens!
3. Increase shutter speed. When you lower your shutter speed, you're also increasing the likelihood of having camera shake, which will make your photos blurry. If you don't have a tripod with you, you'll need to increase the shutter speed. Rule of thumb: don't shoot slower than your focal length to prevent camera shake. With my 50mm lens, my shutter speed shouldn't be less than 1/50s. This doesn't apply if you're using a tripod.
4. Use a tripod. Nothing keeps your camera more still than a tripod. I've never found it necessary to use a tripod in the daylight, but if you're shooting in low light situations a tripod can make a huge difference! Sometimes you need a longer shutter speed than you can manage with your focal length. That's where your tripod comes in handy. I took the photo on the left without my tripod and the photo on the right with a tripod. The photo on the right looks much clearer, it's especially noticeable if you look at the lamp and the fabric pattern on the chair.
6. Change your auto focus mode. I talked about this last week. If you've never changed your focus mode, it's probably on One Shot Focus, which will give you blurry photos of moving subjects, like kids and dogs.
Do you have trouble taking sharp photos?