Selling points in general are the benefits of your product and reasons why customers should purchase your specific product.
Unique selling points are often 1-2 selling points that separate your product from your competitor's products.
How to find great selling points:
Check competitors who sell the same product as you - what features are they highlighting? Check Amazon listings of the same product - what are they highlighting? Check your suppliers’ listings on Alibaba/Aliexpress - what are they highlighting? What problems does your product solve and how does it solve them? What is unique about your product compared to other products/solutions? Ask people in your target group what they appreciate about your product. What do they care about? Why would they purchase your product? A/B test different selling points and the order of them on your page. Here’s a great example from Caraway 👇🏼