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Well, you can learn actively from researching opens source projects. Or you can learn passively by watching others code.

The first is more effective but the second is easier and more entertaining.

I disagree with this. I think you are not passive watching live coding almost the same way like you are pair programming and you are the observer.

Watching a stream is passive, like watching a movie. Pair programming is interactive, as you are right next to the person.

Unless you're commenting on the stream, it's a very passive act of learning.