Hope you find the free Photoshop tutorials useful. Though reading in the same listed order is not necessary, it is easy to understand if it read in the same order.
1. Introduction – Talks about various kids graphics software and online photo editor
2. Photoshop Part 1 – Introduces brush size, hardness, eraser, foreground, background
3. Photoshop Part 2 – Introduces to use brush like stamps
Videos
1. How to make a burger without layers
2. How to make burgers with layers