It is best practice to install any packages into a virtual environment. (Directions coming soon)
Enable that virtual environment.
Install Spyder by entering the command:
pip install spyder
Once the package is installed you may run the GUI app by typing
spyder3
from the command line within the virtual environment.
Full installation documentation may be found on the Spyder IDE site, however I prefer the non-recommend PIP method as not to contaminate the OS with any extraneous software.
Additionally, there is a code-completion add-on, named Kite, that is super helpful, but I have not written out instructions on how to install this yet.