After the basics

Question

what to do next after covering the basic knowledge of any language. how to practice or develop expert level skills.

Answer 1

doing challenges and actually coding

Answer 2

Keep reading. Keep practicing (make something with what you learned). You can read all resources available, but your mastery comes from actual hands-on practice.

Answer 3

define domain of interest (eg. data mining, life sciences, machine learning, statistics, etc.), quizzes, quizzes, quizzes, books for advanced Learners, and check Coursera

Answer 4

Think in problems that you have and how you could create a program to it.
Example: Create a program that sum your note on school or create a game that like a quiz.

Answer 5

practice by doing projects

Answer 6

where am I going to find projects or some basic level sample codes?