Here's how to cut out an image in Photoshop CC.
Go to "File," "Open," and open your image.
Right-click on the object selection tool
from the toolbar on the left.
Select "Quick Selection Tool."
Click the box for "Sample All Layers"
if you're working with a composite image.
You can also click "Enhance Edge"
for a more precise edge selection.
Click "Select Subject" in the upper toolbar.
For less up-to-date Adobe Photoshop versions,
you'll have to manually outline the subject
in the foreground.
Photoshop has multiple tools,
such as the lasso tool,
marquee tool, and the magic wand tool,
for outlining your subject.
If you would like to smooth
the edge of the area you are cutting,
click "Select and Mask" in the toolbar above your picture
while your chosen area is selected
but not yet cut out.
Your selection will open in the new dialogue box
with options to refine, affect the edge detection,
and multiple other options for tailoring your selection
to your specific needs.
Now that you have your area selected,
you have a few options.
Simply press delete or backspace on your keyboard
if you want to remove this part of the photo entirely.
If you'd like to use your selected area elsewhere,
select "Cut" from the edit menu,
open the image you'd like to put your cutout into,
then select "Paste" from the edit menu.
You can also use the keyboard shortcut
command + X for cutting
and command + V for pasting.