>Is there a good way to learn a new language from a more theoretical point of view i.e. by understanding the foundational principles upon which it was designed?

>Is there a good way to learn a new language from a more theoretical point of view i.e. by understanding the foundational principles upon which it was designed? No. Schools follow this method. I doubt anyone acquired a language in school. I have acquired 3~4 languages, having practically nothing in common, before ever going to school at age six. (Kabyle, French, Algerian, and Arabic. Algerian is a mix of Arabic, Kabyle, French, Spanish, Italian, Turkish, and Arabic but with a structure closer to Hebrew than to Modern Standard Arabic, and is unintelligible in the "Arab world") What has worked for me is content consumption. Reading/watching/listening to content in my target language about topics that interest me. I will read about whatever I usually read about, just in my target language. Language acquisition can be tedious, doing it through topics that do not interest you is a sure way to give up.