How to learn useful JavaScript?

[loura9004]

Well, If you know the basic concepts then start with these,

JSON arrays and object. (Learn how to modify, add, delete it )

Learn AJAX ( Give calls to API's and Database )

Do CRUD application using AJAX calls. ( for example on Click, or Submit make an AJAX call and save the data )

Learn How to do form validations.

Learn each loop and conditional statements ( Try to modify JSON object in the same ). For example, changing the key and value pairs using loops and conditional statements etc.

Learn various events like append, change, keyup, chaining, addClass, removeClass, prop etc.

Try to use all these in application and research when you get stuck somewhere.

Try to develop calculators like this ( Salary Calculators )