The following product attributes are a must

Image
Title
Price
Star ratings + # ratings
Product variations, if any (typically in the form of color swatches)

Title

The product title should be a no-brainer. It should be clear, descriptive, and unique. You should also try to keep it as short as possible without compromising on its descriptive functions.

What to include in a title:

Brand/producer/designer name (this can be shown as a separate component, on its own line)
Model name if applicable
Product name
Product variant, product color, or material
Size or any unit of quantity

Plain titles like shirt, pants, phone, or TV should be avoided as they convey little meaning. Adjectives like good, excellent, high-quality, or superior should also NOT be used in the product title. They’re tacky and make it look like you’re overpraising unworthy items.

Examples

Here are a few examples of good and descriptive product titles:

Tommy Hilfiger men’s checked cotton shirt XL
Samsung 49 inches Q80T 4K UHD HDR Smart TV

Image

Having high-quality product images cannot be overemphasized. This is discussed extensively in BP #48: Have multiple high-quality product images.

Price

Failing to include the price on your product is for lack of a less offensive term, extremely stupid. It’s a pretty common pet peeve on many social media listings but no serious e-commerce site I’ve reviewed has made this mistake.

Your prices have to be hard to miss and should be written in a large bold font.

Ratings

Ratings have become an inescapable part of the online experience. People like to see the impression others have on something before they spend their money on it.

Product Variations

These are typically different versions of a specific product or design. Take the example of a cup, a speaker, a car, or a pair of shoes. The same exact product can come in a variety of colors. These are usually represented by color swatches or included in the product gallery.

List View vs Grid View

If your products are heavy on specs, you might opt for a List View instead of a Grid View, in which case you can show more attributes than those mentioned above. (see examples of this in best practice #185)