for a head start in js you can do the sololearn js course that is good free course,you will be very familiar with basic js and after that learn ajax,promises etc and make some little fun webapp with js.It doesn't have to be great app but make some you will learn more well by doing so :)
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for a head start in js you can do the sololearn js course that is good free course,you will be very familiar with basic js and after that learn ajax,promises etc and make some little fun webapp with js.It doesn't have to be great app but make some you will learn more well by doing so :)