Alright, now that we know how Photoshop is put together, we can venture forth and explore some of its functions that you should know about to effectively work with PS.
We have already acquired a general idea of how layers work and how they are helpful to us, but there are many facettes worth mentioning.
You probably know that you can easily name and rearrange your layers. But you can also select multiple layers and group them by pressing CTRL + G. You can even group groups!
This is an excellent method of keeping your image files nice and tidy even if you have hundreds of layers.
With newer versions of Photoshop, you have a pretty amazing feature know a _adjustment layers_. These layers do the same things that your ol' regular image adjustments do, except without permanently changing the pixels in your image! This means that you can always change, reorder or delete these layers without affecting the underlying layers!