Photoshop - Show Transparent ArtBoard

While creating new files (Alternative 1):

For existing files with non-transparent ArtBoard (Alternative 2):

 
Keywords:
Photoshop - Show Transparent ArtBoard

Resize or Crop Image (Canvas)

Crop Image \ Resize Canvas (Alternative 1):

Crop Image \ Resize Canvas (Alternative 2):

Resize Image \ Canvas:

Keywords:
Resize or Crop Image (Canvas)

Photoshop - Transparent Background

Save as ".png" file in order to preserve the "transparent" colors:

Keywords:
Photoshop - Transparent Background (Remove colors)

Photoshop - How to Fill (Paint Bucket Tool)

Keywords:
Photoshop - How to Fill (Paint Bucket Tool)