The most basic tips in every photography is the RULE of THIRD.

The idea behind the rule of third is to imagine the 2 intersection lines as     shown in the image above. The rule of third suggests that we put the most important subject into the intersection line (the dark Plus + sign in the above image).

If you watch TV news reporter daily, you may notice that the news reporter usually is positioned to the side of the screen rather on the main center of the TV screen. This in fact follows the rule of Third.

Here is an example of Rule of Thirds:

As you can see, the boat which is my important subject in this photo is placed on the lower right intersected line. Using the Rule of Third provides a pleasant to the eyes photo because the image is in balance.

In conclusion, if you wish to have a pleasant to look at image, remember to use the Rule of Third to capture your main subject. However, the rule of third is purely for guiding you and you do not have to follow it if you think you can produce better image without using this rule.