WooCommerce is probably your best choice for eCommerce in WordPress.
WooCommerce is hugely popular and now powers over 40% of all online stores. It is so commonly used that WooCommerce was purchased by Automattic and Matt Mullenweg back in 2015. This might be controversial to say, but it is close to being the "official" WordPress eCommerce plugin.
In this week's video release, Rod Martin updates our WooCommerce class. This class is now over 30 videos long and covers every aspect of getting started with WooCommerce.