Good evening. Can you advise a novice salesman, how difficult it is to keep records in Amazon, what do I need to know? Where can I download Form 1099-K and how do I work with it? Please share some helpful tips. Thank you)

Amazon offers key information about your success in the marketplace. Each one contains a full review of your advertising effectiveness, reviews, pricing, and more. In short, Amazon seller reports can help you identify what's not working in your strategy. Such knowledge can help you make better data-driven decisions to increase your sales.
As an Amazon seller, it is important to understand your Amazon 1099-K https://myrealprofit.com/blog/1099k-form-for-amazon-sellers/ report and how it is calculated. This report will show the number of gross sales collected by Amazon and can be used for tax purposes.
You should download the appropriate reports from your Amazon Seller Central account to make sure the numbers are correct.

At first it seems very complicated, but it is possible to figure it out on your own. There is a lot of accessible information written in simple language. And of course you can contact support.