My understanding is that the tracker collects your information, not the trackee, from the tracking pixel, correct? So that doesn't give some random website any

My understanding is that the tracker collects your information, not the trackee, from the tracking pixel, correct? So that doesn't give some random website any additional information about you. But I'm really curious here, because I'm an applications developer and sort of in the dark about a lot of web technology. If I wanted to create a website that just absorbs the kind of information you're alleged is possible, how precisely is that done? How do I access the user's browsing history that you claim is possible? Is there a tutorial on this hand-waving AI-magic? Even if I had somehow acquired a mega database of granular user data, how do I key in on the random-user-that-just-loaded-my-page? Sorry if I being incredulous. It's because I am.