There are many ways you can learn how to build an ecommerce website. You can take an online course, read books or articles on the subject, or hire a web developer to build one for you.
If you want to learn how to build an ecommerce website on your own, there are plenty of resources available online. You can find online courses that will teach you the basics of web development and design, or read articles and tutorials on how to create an ecommerce website. There are also many helpful books available on the subject.
If you don't want to learn how to build an ecommerce website yourself, you can always hire a web developer to do it for you. This option will usually be more expensive than building one yourself, but it will be less time-consuming.