If you've found the Microsoft (app) Store, you know how convenient it is. If you haven't used it yet, this will show you how.
Click the Start button, lower left of the screen and find the Microsoft Store tile, a shopping bag with the Windows four pane logo on it. Click it. If you don't see the icon, in the search bar at the bottom, type "Microsoft Store" and it should be a top result.
The Microsoft Store window will pop up similar to the one at left.
Click Search then type "Python". Choose Python 3.7, 3.8, 3.9, 3.10, or 3.11 as you wish. In general, newer is better, but some software does not yet support later Python versions.
The app window shown at the top of this guide page will pop up.
The app is free. Click the Get button - unless you have a "See System Requirements" link below the Get button - it's likely you need to upgrade Windows 10 as shown on the previous page of this guide.
Use
The program will install two ways to get to Python. The first is a command line version in a Windows command prompt.
You are placed in a REPL and can type "help" to see the commands available.
To close the window (you will lose your work if unsaved) type "exit()"
IDLE
IDLE is the Python 3 official editor.
IDLE also shows the Python 3.7 REPL but has menu commands at top allowing you to do a number of actions. This may be the best mode to use Python until you are familiar with things.