Inverse, All Layers, Deselect Layers, and Similar Layers
Inverse: This tool is probably one of the most under-estimated within the batch. I love this tool. Inverse allows you to select a part of an image, go to inverse, and Photoshop Elements will select the exact opposite of what you’ve just selected. I use this all the time when I want to put a portion of my photo on a new background. Rather than selecting every pixel of the background to delete it, I select an easier portion of the image, go to inverse, and it will select the background for me!
All Layers: If you’re working with a multi-layer document, this is a great tool to have. If you draw a marquis around a layer, you’re only selecting that layer, nothing under it. Select all layers allows you to select every layer and work with them as a whole.
Deselect Layers: Does the same as deselect, but will deselect all layers rather than just the layer you are working on.
Similar Layers: This select option allows you to select layers of the same type such as all text layers, or all adjustment layers.