A good photographer thinks that lines have a few uses in a photograph. For example, lines in a scene can divide, unify, or emphasize certain parts of a composition as well as being the visual subjects in themselves worthy of taking a picture.
Here are a few situations which can be photographed to get a hang of line photography like spider's web, shadows of railings, shafts of light from a cloud, lines in sand dunes, railway lines, rows of electric poles, lines of a net, country roads, curved rivers, fences, slopes of hills, wriggling snake, garden benches, terrace cultivation etc.
To produce dramatic effect in a composition, one can at times blur the lines or go for pro-line photography in a studio. Parallel lines that appear to converge at one-point provide linear perspective to show distance and depth in a photograph.
Similarly, leading lines are most effective when there is some relation between the line and the subject, such as steps leading to a door. The impact of lines can be further enhanced with a wide-angle lens and finding a vantage point close to the beginning of the lines. For instance, kneeling to get close to train tracks provide a better perspective.
Photographers also find that the direction of lines can be forceful mood setters. Straight lines, whether vertical or horizontal, seem stable and formal. The curved lines have sensuousness and winding or spiral or wavy lines are alluring. In line photography, a generally accepted practice is to use the camera in portrait format for predominantly vertical lines and landscape format for pictures having predominantly horizontal lines.