a practical first steps error free way of testing python code e.g. from repos online in the browser

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Hi everyone,

i just wanted to ask you a quick question on python code from repos e.g. when i am wanting to compile a software from any repo which has a lot of stars and is popular among different os macos or linux or win11

or am i misunderstanding something, isnt jupyterbook something i can test this repo software online without installing it on my machine and perhaps brake my system with e.g. wrong cmd before or etc vice versa

i was looking for a tiny way to circumvate things before it gets different, on a machine where ten s of things can go wrong,

thank you