Amazon

Amazon isn't the platform you fall in love with — it's the one you never really leave. Over 220 million people pay for Prime, and the site carries hundreds of millions of products, which means the question is rarely whether Amazon has what you want but whether you can be bothered to look elsewhere. Next-day delivery, painless returns, and a review system deep enough to actually be useful make it the default first search for almost any purchase. The catch: for anything niche, handmade, or genuinely cheap, better options are further down this list.