Focus is vital. Capturing your subject in crisp, sharp focus requires skill and practice. You need to understand the various auto-focus controls on your camera. Here are some focusing tips for beginners to help you get sharp photos more consistently.
There’s no fixing an out-of-focus photo
Many digital photographers like to use the various sharpening options available in software. Don’t be tempted. I have never known an out-of-focus photo to be well improved with post-production manipulations.
Sharpening in post can, however, help images that are a little soft. This is often due to lens quality rather than poor focusing. Either your photos are in focus or they are not. Focusing tips for beginners are important to understand. There is no fixing an out of focus photo with your computer.