The phrase "best selling" means the item or product has sold more than any other item in its category. It is the most popular and has been purchased by a large number of people. Full definition
I have heard of best selling authors who are jealous of others who are bigger best - selling authors. (redeeminggod.com)
The majority of best selling authors (61 %) dedicated five hours or less to book marketing each week. (lulu.com)
«The process is more important than the money» I've read tones of financial best selling books of how they became successful. (learntotradethemarket.com)