Also from the many books that I have read I have learned that all of them include a practical experience.
I guess it would be good to provide a chapter of how to make the simplest application on every language and tech.
It would be good that the same use case is described first and then the experts on every contribute with their implementation. So that learners can have a template bootstrap app according to the topic they are interested.
Every of those templates can be a repo in github.
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