What is the best practice for bugs free code?

Don't write code. That's the best way to produce no bugs.

To produce at few bugs as possible is dependent on the company's culture, your own preferences and your coworkers preferences.

For me: I am absolutely not productive when doing something like extreme programming, while others love it.
So I'll just stick with code reviews and and a focus on testing

@Prutser Ha Ha Ha....
if i am single developer and working as single then how can i achieve this without writing code ☺☺☺

Hmm... that makes it a bit harder. But maybe something like test driven development?

https://fastcompany.com/28121/...

Article is a bit long, but every programmer should read it

Solve problems before writing code and write clean standard compliant code...