The easiest way for artists who don't know code to build an online store is using Shopify. This website builder platform makes it easy to set up a website and add a shop to it. This will allow you to list products such as paintings, drawings, prints, books and more, and sell them directly to the public. You'll be take payments from a variety of payment providers, and there are also marketing tools to help promote your work.
There are countless other features to help customise your store, including integrating it with your social media accounts. Overall, you'll pay more than with other website builders, but the extra income may potentially more than compensate for that.