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It means that a layer mask is only one option in isolating a selected area. It's not always indicated for use. It depends on what you're doing with the selected area.

OK.......again......marching ant selections can be saved and are used to create a selected area via layer masking, etc..............are you referring to a marching ant selection or a selected area? Since you do not post screenshots, you need to be specific with your terms so that we can understand you.

(Note: Marching ant selections can be used to determine boundaries within which to work..........they have many functions.)

Yes and no. You can create a layer mask from a marching ant selection or it can create itself when using adjustment layers depending on the order of your workflow.

Correct. It all depends on what you're doing. Since I don't have screenshots to help, I have to make assumptions on what might work best for your situation.