To add a simple product using WooCommerce to your e-commerce website, follow these steps:

1. Log in to the WordPress dashboard for your website.
2. Go to the “Products” section and select “Add New.”
3. Enter the product name in the “Product name” field.
4. Write a brief description of the product in the “Product description” field.
5. Upload an image of the product in the “Product image” section.
6. Scroll down to the “Product data” section and select “Simple product.”
7. Enter the price of the product in the “Regular price” field.
8. Optionally, you can set a sale price for the product and a date range for the sale.
9. Scroll down to the “Inventory” section and set the stock quantity for the product.
10. If you want to manage stock for this product, select “Manage stock” and set the stock status to “In stock.”
11. Go to the “Shipping” section and enter the product’s weight and dimensions.
12. In the “Linked Products” section, you can upsell or cross-sell related products.
13. In the “Attributes” section, you can add any relevant product attributes, such as color or size.
14. Finally, click the “Publish” button to publish the product on your online store.

With these steps, you can successfully add a simple product to your WooCommerce store. Remember to regularly review and update your product information to ensure that it remains accurate and up-to-date.