A Public domain for Shabbos purposes is at least 15 Amos wide. The “King’s Highway” should be at least twice as wide. In Washington DC Pennsylvania Avenue is our equivalent to this and is considerably wider.
I am now learning the same Gemora that I learned a long time ago in Yeshiva. My outside knowledge and life experiences help me get a much better understanding of many concepts.
I realize that there a some who can gain a great and deep knowledge of their learning without the input of outside knowledge / experiences. They they have a special “Help from Above” and are very few. They rest of us have to use normal means to acquire knowledge.