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If you don't do it, how can you know what's going on inside and how it works?

I don't think practicing how to spin up a hello world web app from zero is gonna be very good at teaching you how it works inside.

Most of the inner working is hidden

Do you need to know what's going on inside? Or can you trust a colleague who's responsible for that?

If you don't know what's going on inside, how can you claim to have an opinion about its reliability and suitability?