Framing is an essential part of taking a great photograph. As a starting point the rule of thirds is a good guideline to follow. This proposes that a image you wish to photograph should be imagined to be split into 9 equal squares…a grid involving two horizontal and two vertical lines. Many cameras these days allow for a grid image to appear when slightly pressing down the shutter button in order to help you. Once you imagine this grid, as demonstrated in the image below, the subject of interest that you are trying to capture should be placed along the lines or their intersections.
Of course, these rules can be broken and in some cases it works a lot better to subvert the conventions, like I have previously mentioned, this is a good starting point.