Basic actions on files
  - File types and differences.
  - Creating new file.
  - Opening existing file.
  - Closing files in safety way.
  - Saving opened file, and file types saving.
  - Saving optimized images.

User Interface 

Working with tools and colors
  - Learn about colors.
  - Using the paint tools.
  - Using the deleting tools.
  - Using the text tool.

Layers
  - The first upper layer.
  - Another layers.
  - Basic layers actions.
  - Arranging layers.
  - Transparency of layers.
  - Layers styles.
  - Useful actions.
  - Layers folders.
  - Layers locking.

Filters - One of the must powerful tools.
  - Learn about the filters and their uses.
  - Learn using filters.

Good Luck

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