What is the best way to learn JavaScript?

Answer 1

By doing it

Answer 2

Start with simple DOM manipulations
-add and remove elements
-learn about events , such as mouse and clicks
-add and remove CSS Styles

make small app like my address book

https://code.sololearn.com/Wy8NOf5lt1WF/#html

or try and build simple todo list.

avoid using libraries and frameworks such as jQuery or Bootstrap