Assuming you are referring to the process of buying something online:
When you buy something online, you will first add the item (or items) to your cart. Once you have everything you want in your cart, you will go to the checkout page. On the checkout page, you will enter your shipping information. This includes your name, address, and sometimes phone number. After entering your shipping information, you will be prompted to enter your payment information. This can be a credit or debit card, PayPal account, or other form of payment. Once you have entered all of your information and clicked submit/purchase/etc., your order will be processed and on its way!