Welcome Rajni, we are glad to have you here. I hope you are getting settled into the Community and finding content and people that can help you in your work.If you haven't found these already here are some places in the community that might be of interest to you:
ArcGIS API for JavaScript
If you need any help in using the Community features then our GeoNet Resource Hub has lots of helpful documentation and the team are always available to help if you need to email us geonet@esri.com