Приложение Javascript в eclipse

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Hi am a newbie I ran javascript in eclipse photon. I clicked on 
 File>New>Project>Javascript Project>Project name>ECMAScript Built in Library and ECMAScript 3 Browser Support Library.

When I got to 
ECMAScript Built in Library 
ECMAScript 3 Browser Support Library.

I did not know what to do next please someone should kindly help me out.

Thank you
Regards

Awal Swed

What I have tried:

I have tried youtube video but could not come across a video to guide me

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