How to sketch / outline an image in Photoshop ?

I Dont know how to outline an image in photoshop and then found a solution online .

Solution Steps:

1. Open any photo to be sketched/outline in Photoshop.
2. First change the background lock layer to layer 0(or rename it ) by double clicking on the layer.
3. Then duplicate that layer
4. Now with focus on duplicate layer . Go to Adjustments -> Invert . Now white color turns to black and vice versa.
5. Now change the blending mode of layer to color dodge.
6. Then Go to Filter -> others -> Minimum.
7. There comes the Outline/sketch of your image.