Hi John,
Spyder 6 is not finished yet; only an alpha version has been released (in case you don't know, an alpha version is a half-finished product which still suffers from bugs and other problems). If you are new to Python and Spyder, I would recommend that you don't install the alpha version because if something is not as you expect, you won't know whether that is because you did something wrong or because there is something wrong in Spyder.
However, the alpha version is not a secret and if you really want to, you can install it. Use a virtual environment, so that you can easily undo the installation if something goes wrong. See for instance the guide
Installing packages using pip and virtual environments if you need to learn how to do this. Once you are in a virtual environment, the command for installing the alpha release of Spyder using pip is
python3 -m pip install --pre spyder
The --pre flag indicates that you want a pre-release (a version that is not yet ready to be released).
I hope this answers your question.
All the best,
Jitse