Use Amazon Smile to give back to charity when you shop. You can choose an organization dear (or local) to you and shop as normal. However, it's important to note that only about 0.5% of every purchase makes its way to charity, and you might do more good by giving more tangibly elsewhere. However, if you don't let shopping through Amazon Smile negate all the good you would have done otherwise, it's a great way to maximize your shopping.
To learn who your competitors are: You can monitor price comparison websites to see who your competitors are. With so many new brands popping up each day, it can be hard to keep track of who’s quickly climbing the ranks within your niche. You can discover new competitors using price comparison programs. So, why not compare yourself to your competition, before your customers do it.

The Amazon sales rank (ASR) provides an indication of the popularity of a product sold on any Amazon locale. It is a relative indicator of popularity that is updated hourly. Effectively, it is a "best sellers list" for the millions of products stocked by Amazon.[134] While the ASR has no direct effect on the sales of a product, it is used by Amazon to determine which products to include in its bestsellers lists.[134] Products that appear in these lists enjoy additional exposure on the Amazon website and this may lead to an increase in sales. In particular, products that experience large jumps (up or down) in their sales ranks may be included within Amazon's lists of "movers and shakers"; such a listing provides additional exposure that might lead to an increase in sales.[135] For competitive reasons, Amazon does not release actual sales figures to the public. However, Amazon has now begun to release point of sale data via the Nielsen BookScan service to verified authors.[136] While the ASR has been the source of much speculation by publishers, manufacturers, and marketers, Amazon itself does not release the details of its sales rank calculation algorithm. Some companies have analyzed Amazon sales data to generate sales estimates based on the ASR,[137] though Amazon states:
Throughout the store there are features like “Most-Wished-For,” a collection of products that are most added to Wish Lists; “Trending Around NYC,” hot products that NYC-area customers are buying on; “Frequently Bought Together”; and “Amazon Exclusives.” These features, along with customer review cards with quotes from actual customer reviews, make it fun and easy to shop.