Note: This post was written for an older version of Photoshop. The View > New Guide menu path still works in modern Photoshop, but the faster modern method is to drag from the ruler (Ctrl+R / Cmd+R to show rulers) directly onto the canvas. Screenshots here reflect an older Photoshop version.
Guides in Photoshop allows you to place images and elements precisely. Guides are nothing but non printable horizontal and vertical lines. Photoshop allows you to have as many as horizontal and vertical guides you want. Photoshop also allows you to move and remove guides. Here is how you can play with those guides!
Continue reading Adding Guides In Photoshop: One Second Tip