From https://eruvinitiative.org/eruv-basics/ https://eruvinitiative.org/eruv-basics/ In fact, an entire tractate of the Talmud, called “Eruvin,” is focused o

From https://eruvinitiative.org/eruv-basics/ https://eruvinitiative.org/eruv-basics/ In fact, an entire tractate of the Talmud, called “Eruvin,” is focused on discussing these topics. Most subjects regarding Eruvin are fraught with differing opinions of Jewish Law, and therefore it is of utmost importance that questions related to the Eruv should be discussed with a Posek (Jewish Legal Expert. There's a bunch of info on that site. I just watched the video on "How to Make a Home Made Shabbos Belt", which is a hack to meet some rules about carrying keys on Saturdays. Not Jewish, I just enjoy systems of rules.