Install Python 3
A step-by-step guide
Why This Guide?
This XKCD comic sums up the issue. Historically, installing Python on a computer has been confusing for professional programmers and a nightmare for newcomers. But things are improving. Today there are relatively straightforward ways to install and update Python on various operating systems.
If you are a professional programmer, I highly recommend reading the setup choices of Jacob Kaplan-Moss, co-creator of Django, which covers more advanced options like pyenv, pipx, Poetry, and so on.