Selling a product on WordPress involves several steps:

Install an e-commerce plugin: To sell products on WordPress, you will need an e-commerce plugin that allows you to create a product catalog, shopping cart, and checkout system. Some popular e-commerce plugins for WordPress include WooCommerce, Easy Digital Downloads, and WP eCommerce.
Set up your product catalog: Once you have installed an e-commerce plugin, you can create your product catalog by adding product descriptions, images, and prices. You can also organize your products into categories and tags to make it easier for customers to find what they are looking for.
Configure your payment gateway: To accept payments for your products, you will need to set up a payment gateway. Popular payment gateways include PayPal, Stripe, and Authorize.net. Your e-commerce plugin should have built-in support for one or more payment gateways.
Add a shopping cart and checkout system: Your e-commerce plugin should also provide a shopping cart and checkout system that allows customers to add products to their cart and complete their purchase. Make sure to test the shopping cart and checkout system to ensure that it is functioning correctly.
Optimize your product pages for search engines: To increase the visibility of your products in search engine results, you should optimize your product pages for relevant keywords. Use descriptive product titles and descriptions, and include high-quality product images and videos.

Promote your products: Once your product catalog is set up and your website is optimized for search engines, it’s time to start promoting your products. Use social media, email marketing, and other channels to reach potential customers and drive traffic to your website.
Provide excellent customer service: Finally, make sure to provide excellent customer service to your customers. Respond promptly to inquiries and provide support when needed to ensure that your customers have a positive experience and are more likely to make repeat purchases in the future