How does the difference in the pressure at two places determine the movement of air

The air move from high pressure areas to low pressure areas. 

For example: land breeze and sea breeze

Land being solid surface can easily absorb and release heat radiation. While sea being liquid heats up slowly and also loses this heat slowly.

During the day time, land surface being hotter, hot air from land surface rises up creating a temporary low pressure zone which drags cool air from the sea to the land. Thus, we have the sea breeze.

During the night time, the land surface is cool as it loses its heat quickly. But the sea surface is still hotter as water bodies lose heat slowly. So, hot air from sea surface rises up and cool air from the land surface moves towards the sea. Thus, we have land breeze.