To fill a whole layer in Photoshop with color, use the following command:
There are a few ways to fill Layers in Photoshop. One way is to use the Layer Mask tool. To use the Layer Mask tool, you need to click on the little circle next to the layer thumbnail in the Layers palette, and then drag the mask thumbnail into the layer below the layer you want to fill.
To fill a cell in a table using the keyboard, use the following keys: spacebar, left arrow, and right arrow.