Hey @figuerres,
Thank you so much for your suggestions to improve our content 
I really appreciate your feedback.
Related to the application names and callback URIs (but this also applies to audiences and any other parameter that is specific to an application), keep in mind that the ones proposed in the articles are like placeholders. You need to customize them based on your needs, environment, preferences, etc.
For example, for the callback URI for a native application, the article proposes myapp://callback, but you should define yours also based on the best practices for your operating system. See here for some context.