notes-

if you want to move several layers at the same time, use shift to select them.
if you want to edit the background layer, double click it and just rename it.
how to get the selection back: ctrl +click the layers thumb and now you have a selection.
the short cut to fill is the key alt + delete.
work flow:name alll your layers. double click on the layer and name it.
if you are in ever doubt please slowely turn all your layers off.