Probably 'Casino Royale'. It was the first Bond novel and really set the tone for the series. It introduced Bond's character, his gambling skills, and his way of dealing with enemies.
The James Bond series has many novels. 'Dr. No' is an important one. Also, 'From Russia with Love' and 'Goldfinger' are among the popular ones in the series. These novels not only tell exciting spy stories but also depict the character of James Bond in great detail, his charm, his skills and his adventures around the world.
I think 'Goldfinger' is among the most popular. It has that iconic villain and the exciting story of trying to stop his evil plan. Also, 'From Russia, with Love' is very popular as it has a great blend of espionage, action and a touch of romance.
One of the well - known ones is 'Goldfinger'. It's famous for its thrilling plot and the iconic character of Auric Goldfinger. The graphic novel adaptation captures the essence of the original story quite well.
It's hard to list them in a strict order as it depends on personal preference, but if I had to start, 'Casino Royale' would be high up. It was the first Bond novel and set the foundation. Next could be 'From Russia with Love' which built on the Bond character and introduced more complex plots. Then 'Goldfinger' which is just so iconic. But really, different people might shift these around based on what they value most in a Bond novel, like the villain, the setting, or Bond's relationships.