Let's say I live streamed implementing Stripe. There's no way to avoid not showing my test API keys if I'm going to show the end to end process of setting everything up. The best I could do is to roll the keys before I start the stream but this degrades the quality of the stream since it's not from scratch.

Of course those keys and anything else that's sensitive would be sitting in an .env file, and I'd also have an .env.example file showing how it's set up without anything sensitive being in there (I do this already in my pre-recorded videos). Even going as far as preventing the real .env file coming up when I fuzzy open files so I don't open it by accident and the contents of that file being ignored from multi-file searches.