Grids

Grid-A grid is a 2D structure of intersecting lines ( vertical, horizontal or angular) that an artist or designer uses to structure content.

Rule of thirds
 Rule of thirds are used for pictures to perfect them. For example, an artist might use this method to measure the objects in the image they are painting on the sheet for a better outcome.

 How to create a grid on Photoshop
   To create a grid on Photoshop you firstly have to enable the grid lines by going to 'view', 'show' and 'grid'.  You then start creating your own grid lines by choosing the single row marquee tool, and dragging from the grid towards the page in order to create horizontal and column lines. To