I’ve made a video about this in the past but basically the reason this works is when you’re sharing out your content through big niche related social accounts they’ll attract a LOT of social reshares and natural links from other websites. And this is exactly the kind of thing that Google likes to see and exactly how I get my sites ranked in the search engines.
With drop shipping, you’re effectively partnering with a manufacturer or wholesaler to sell their products. This way, you don’t pay upfront costs to buy inventory, aren’t sitting on unsold items taking up expensive warehouse space, and don’t have to deal with shipping the products yourself. You simply create your site, fill it with drop shippable products, and drive in customers, with almost everything else done for you.