Well, I only agree with the Survival Skills, Knowledge Building, Goal Review, Rhetoric, and the Creativity parts. But things like language acquisition (English excepted) and meditation aren't really necessary. And believe me, I'm speaking from experience. I know 4 languages: Hindi, English, Sanskrit, French. Only English is really useful for most people. Now Hindi is useful for me since I'm an Indian but for non-Indians learning it won't really bring any extra benefit. As far as French is concerned, it has been absolutely useless for me. Unless you intend to stay in a country where the respective language is spoken, learning new language has zero practical value (again, English excepted).
Martial Arts aren't necessary either. Most types of martial arts and actually just made for show and have no practical self-defense value. In real-life street fighting those fancy maneuvers will just get you killed or injured...
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