There are 2 ways to card online: card digital or physical products. There a lot of loopholes and hurdles to cross while carding digital products which makes it much more strenuous but all of those methods are carding for physical products. In essence, you take a hacked card you bought, setup your hardware to spoof make the card holder's location i.e make it look like you're using the card where the original card holders stays, you then go ahead to order physical products of these sites e.g iPhone, Playstation consoles, jewelries e.t.c you reroute this products to your location and then go ahead to resell them for cash. Basically what you're doing is spending the card like it yours and then selling whatever you order for cash. There's a lot of things to put in place to make this a success but that's basically it.