How do I know if an item is profitable on Amazon?

Apart from doing lots of research, there are several factors to consider when searching for profitable products on Amazon:

1. Look at the bestsellers on Amazon. You can use Amazon's Best Sellers Rank (BSR) metric.
2. Keyword research tools are an excellent way to start your product hunting. Invest in the right keyword research tools to gain a deeper insight into the product search metrics and stats.
3. Study product reviews to identify the most useful and genuine products. Take a closer look at the 3-star rating reviews, as they are often the most honest and unbiased.
4. Use Google Trends to see market trends and variations in the demand for a product.
5. When determining your profit margin, consider product weight, shelf life, dimensions, etc.