Many people get stuck while learning JavaScript Because it's too vast and has different concepts and topics for doing the same thing. 

Here I am sharing with you important topics of JavaScript which are most used while developing a project or can be asked in the next interview.

1. Variables
2. Operators
3. If…else
4. Switch case
5. While Loop
6. For Loop
7. Break statement
8. Function
9. Arrow Function
10. Import/Export
11. Events
12. Async Await
13. Promise
14. JSON
15. DOM Manipulation

Using the above concepts you can build your app by choosing the right framework or just using vanilla JavaScript.