Hi Jessica, Welcome to
RP.
As Doug says, there are several features in
PS that are not available in Elements.
More specifically, and answering some of your other posts, Elements does not have Channels, Curves, or Layer Masks.
Channels looks individually at the Red, Blue, and Green information contained in your image, it displays as a Greyscale (Black & White) image for each.
Curves is a multi-use tool, similar to Levels (which is available in Elements) but more versatile.
Layer Masks are a way of limiting effects on a layer to areas not covered by the mask.
There are work arounds for many of the tools that Elements does not have, and many who cannot afford or do not wish to buy
PS have had great results from buying and using Richard Lynch's, Hidden Power of Photoshop Elements.
If you are a complete novice, then your first buy should be a good book, I can't personally recommend any for Elements, but there is a review section here at
RP, and I'm sure there will be recommendations there. If not post a request, I'm sure there are many members here who will be able to recommend one.