There are some steps to take:

☆ Learn to use the cameras light-meter to assure that you get the right exposure.

☆ Fill the whole frame with the subject of your photo. Do NOT waste any of the space in the frame.

☆ Spend some time becoming visually literate. You can do that by taking classes in art or studying composition and design.

☆ Think before you press the shutter release. If the image does not look good in the viewfinder, it will not look any different after you press the shutter release.