There are several popular online stores, shopping cart platforms, and plugins.
There are pros and cons to all of them, and one of the most SEO-friendly options is WooCommerce: a popular ecommerce plugin for WordPress.
As of June 2022, WordPress powers 64.2% of all content management systems.
That puts it close to the top of the CMS chart.
When looking at ecommerce specifically, WooCommerce is the most popular ecommerce technology among the top 1 million websites. The WooCommerce plugin became so popular that WordPress acquired it in 2015.