Customize Your ArcGIS Online Org Page
An overview of how to customize your ArcGIS Online Organization page. You can use it as a developer to highlight your work and showcase your portfolio. You can use it as an administrator to organize groups and set up security.
http://odoe.net/blog/customize-your-a...
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ArcGIS Web Development - https://www.manning.com/books/arcgis-...
Intro to ArcGIS API for JavaScript 4 - https://leanpub.com/arcgis-js-api-4/