Let’s say you want to buy a fan. What’s the first thing that comes to your mind when you think about buying a new one? Is it going around the store, looking at different kinds of fans, and then deciding that you want to buy the orange-black one from the first store you see? Or do you prefer to take out your phone or laptop, log into your favorite e-commerce platform, look at the range of products available, compare the prices, and read the reviews?eCommerce apps have become the go-to shopping experience. For users, online stores are convenient and reduce any possible friction while shopping. For businesses and developers, they are a must-have to increase their online presence while boosting revenue.If you are a developer looking to build a side hustle, or a new business only dabbling in the world of eCommerce apps, or even just simply interested in how to build an eCommerce app, this article is for you. But first, we need to get through the basics.