How to know if you ready?

Question

How do you know if you are ready to take a programming job and be good on it? How long does it take person to be considered a best programmer?

Answer 1

Along with that, something I’ve noticed as common in many internship descriptions for programming is a good knowledge in data structures and algorithms. They have tons of resources for interview questions online as well.

Sites like Leetcode, HackerRank, Project Euler, CodeSignal and tons more focus on providing problems to solve and interview questions.