How to learn JavaScript Concept Easily...?

Answer 1

It can take six to nine months to develop a working proficiency in JavaScript. There is no way to learn it easily or quickly. But to get a better understanding of each concept, make use of different resources. Sometimes a resource will explain it better than the other and provide more details and examples. Don't rush through the course.

Answer 2

Practice: Write code yourself. Do mini-projects.

Try to understand other people's code and their approach.