More ideas from Vik
Blending Tutorial - Summer School Week 1 | The Lilypad

Here is a video that hopefully will help you. I have included some helps for each mode, and linked the product at the bottom of this long post.

The Amazing Power of The Levels Layer In Photoshop - YouTube

The levels adjustment layer is so versatile, you can use it to lighten a photo, darken a photo, add contrast, add matte and adjust colour.