Really great for messing around with backend code without having to spend a ton of time setting your computer up. Plus you can share the link for a repl.it and colaborate.
https://www.programiz.com/python-programming/examples/hello-world The first program any programmer writes in a new language. Copy the code here into a new repl.it (or whatever else you're using to run python code). Once you have hello world running you're ready to jump into the Intro to Python tutorial.