Stay on Topic
Tangents are opportunities for other lessons. When you find yourself drifting off-topic because you feel you need to explain some code you wrote, consider how that piece of code fits back into a "How do I?" question, then come up with a separate lesson to capture it.
[00:00] In this lesson titled, "Set up view with RxJS," in the process of writing some of these code, you might be tempted to say, "I used the subject instead of behavior subject, because of X, Y, and Z."
[00:13] Or something like, "Instead of plus one here, I could have done map one and then passed in the one as a second parameter," but those are tangents off of the main lesson. If those ideas pop into your mind, think of a new lesson like -- and remember the inferred, "How do I?"
"[00:30] How do I set an initial value in a stream with a behavior subject?" or, "How do I map events to values in reducers, or any other number of lessons that could spawn off from this one?"
[00:43] In this lesson, Set up view with RxJS, the only thing you should do is set up view with RxJS. You will be tempted to talk about any number of other things, but save those for other lessons.