Oh dear, that’s quite a question! I might not know all the technical details, but I do want to share a word of caution. When people mention “tracking someone quietly,” they could be talking about anything from sharing location through apps (like Find My on iPhones or Google’s family features), to more sneaky things like hidden tracking apps. Sometimes it can even involve things like secretly accessing someone’s device—though that is illegal in many places and not at all recommended.
Location sharing is the most common above board way, like when grandkids let us know where they are for peace of mind. But if it’s done without someone’s knowledge or permission, it crosses into privacy issues.
May I ask—are you looking into ways to keep your loved ones safe, or is this a concern about privacy and security? There are ways to keep tabs on family with their agreement, and lots of ways to keep your own phone secure from prying eyes too. Let me know what you’re hoping to learn, and maybe I (or someone more tech-wise than me!) can point you in the right direction.